[M][REQ][JAVA]: Add option to generate arrays with "uniqueItems" true as Sets rather than Lists (#5466)

* [REQ][JAVA]: Add option to generate arrays with "uniqueItems" true as Sets rather than Lists
 - Update Java code generation to use sets instead of lists when uniqueItems is set to true
 - Add import resolution for sets
 - Add tests and fix broke tests

resolve #5254

* Update Javascript, Perl, Python and Ruby to preserve current functionality.

* Switch set implementation to LinkedHashSet

* Fix missing import for uniqueItems used on param.

* Fix missing import and return type for responses with uniqueItems

* Fix default values for array of enum

* Update generated samples

* fix merge issue

* Update generated samples

Co-authored-by: William Cheng <wing328hk@gmail.com>

CI/samples.ci/client/petstore/java/test-manual/okhttp-gson/api/PetApiTest.java

@@ -26,8 +26,10 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.ThreadLocalRandom;
 import java.io.BufferedWriter;
 import java.io.File;
@@ -324,7 +326,7 @@ public class PetApiTest {
 
         api.updatePet(pet);
 
-        List<Pet> pets = api.findPetsByTags(Arrays.asList("friendly"));
+        Set<Pet> pets = api.findPetsByTags(new HashSet<>(Arrays.asList("friendly")));
         assertNotNull(pets);
 
         boolean found = false;
@@ -396,7 +398,7 @@ public class PetApiTest {
         assertTrue(pet1.hashCode() == pet1.hashCode());
 
         pet2.setName("really-happy");
-        pet2.setPhotoUrls(Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2"));
+        pet2.setPhotoUrls(new HashSet<>(Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2")));
         assertFalse(pet1.equals(pet2));
         assertFalse(pet2.equals(pet1));
         assertFalse(pet1.hashCode() == (pet2.hashCode()));
@@ -404,7 +406,7 @@ public class PetApiTest {
         assertTrue(pet2.hashCode() == pet2.hashCode());
 
         pet1.setName("really-happy");
-        pet1.setPhotoUrls(Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2"));
+        pet1.setPhotoUrls(new HashSet<>(Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2")));
         assertTrue(pet1.equals(pet2));
         assertTrue(pet2.equals(pet1));
         assertTrue(pet1.hashCode() == pet2.hashCode());
@@ -423,7 +425,7 @@ public class PetApiTest {
 
         pet.setCategory(category);
         pet.setStatus(Pet.StatusEnum.AVAILABLE);
-        List<String> photos = Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2");
+        Set<String> photos = new HashSet<>(Arrays.asList("http://foo.bar.com/1", "http://foo.bar.com/2"));
         pet.setPhotoUrls(photos);
 
         return pet;

docs/generators/android.md

@@ -36,6 +36,7 @@ sidebar_label: android
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/apache2.md

@@ -24,6 +24,7 @@ sidebar_label: apache2
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/bash.md

@@ -31,6 +31,7 @@ sidebar_label: bash
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/clojure.md

@@ -30,6 +30,7 @@ sidebar_label: clojure
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/eiffel.md

@@ -20,6 +20,7 @@ sidebar_label: eiffel
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/elixir.md

@@ -26,6 +26,7 @@ sidebar_label: elixir
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/erlang-client.md

@@ -19,6 +19,7 @@ sidebar_label: erlang-client
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/erlang-proper.md

@@ -19,6 +19,7 @@ sidebar_label: erlang-proper
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/erlang-server.md

@@ -19,6 +19,7 @@ sidebar_label: erlang-server
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/graphql-nodejs-express-server.md

@@ -20,6 +20,7 @@ sidebar_label: graphql-nodejs-express-server
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/graphql-schema.md

@@ -20,6 +20,7 @@ sidebar_label: graphql-schema
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/groovy.md

@@ -54,6 +54,7 @@ sidebar_label: groovy
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -71,6 +72,7 @@ sidebar_label: groovy
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-inflector.md

@@ -56,6 +56,7 @@ sidebar_label: java-inflector
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -73,6 +74,7 @@ sidebar_label: java-inflector
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-msf4j.md

@@ -61,6 +61,7 @@ sidebar_label: java-msf4j
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -78,6 +79,7 @@ sidebar_label: java-msf4j
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-pkmst.md

@@ -63,6 +63,7 @@ sidebar_label: java-pkmst
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -80,6 +81,7 @@ sidebar_label: java-pkmst
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-play-framework.md

@@ -65,6 +65,7 @@ sidebar_label: java-play-framework
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -82,6 +83,7 @@ sidebar_label: java-play-framework
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-undertow-server.md

@@ -56,6 +56,7 @@ sidebar_label: java-undertow-server
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -73,6 +74,7 @@ sidebar_label: java-undertow-server
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-vertx-web.md

@@ -56,6 +56,7 @@ sidebar_label: java-vertx-web
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -73,6 +74,7 @@ sidebar_label: java-vertx-web
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java-vertx.md

@@ -59,6 +59,7 @@ sidebar_label: java-vertx
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -76,6 +77,7 @@ sidebar_label: java-vertx
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/java.md

@@ -72,6 +72,7 @@ sidebar_label: java
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -89,6 +90,7 @@ sidebar_label: java
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/javascript.md

@@ -42,6 +42,7 @@ sidebar_label: javascript
 |array|Array|
 |list|Array|
 |map|Object|
+|set|Array|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-cxf-cdi.md

@@ -67,6 +67,7 @@ sidebar_label: jaxrs-cxf-cdi
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.LocalDate|
 |LocalDateTime|org.joda.time.*|
@@ -84,6 +85,7 @@ sidebar_label: jaxrs-cxf-cdi
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-cxf-client.md

@@ -60,6 +60,7 @@ sidebar_label: jaxrs-cxf-client
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.LocalDate|
 |LocalDateTime|org.joda.time.*|
@@ -77,6 +78,7 @@ sidebar_label: jaxrs-cxf-client
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-cxf-extended.md

@@ -82,6 +82,7 @@ sidebar_label: jaxrs-cxf-extended
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.LocalDate|
 |LocalDateTime|org.joda.time.*|
@@ -99,6 +100,7 @@ sidebar_label: jaxrs-cxf-extended
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-cxf.md

@@ -77,6 +77,7 @@ sidebar_label: jaxrs-cxf
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.LocalDate|
 |LocalDateTime|org.joda.time.*|
@@ -94,6 +95,7 @@ sidebar_label: jaxrs-cxf
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-jersey.md

@@ -63,6 +63,7 @@ sidebar_label: jaxrs-jersey
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -80,6 +81,7 @@ sidebar_label: jaxrs-jersey
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-resteasy-eap.md

@@ -62,6 +62,7 @@ sidebar_label: jaxrs-resteasy-eap
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -79,6 +80,7 @@ sidebar_label: jaxrs-resteasy-eap
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-resteasy.md

@@ -61,6 +61,7 @@ sidebar_label: jaxrs-resteasy
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -78,6 +79,7 @@ sidebar_label: jaxrs-resteasy
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jaxrs-spec.md

@@ -67,6 +67,7 @@ sidebar_label: jaxrs-spec
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.LocalDate|
 |LocalDateTime|org.joda.time.*|
@@ -84,6 +85,7 @@ sidebar_label: jaxrs-spec
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

docs/generators/jmeter.md

@@ -23,6 +23,7 @@ sidebar_label: jmeter
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/k6.md

@@ -23,6 +23,7 @@ sidebar_label: k6
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/markdown.md

@@ -23,6 +23,7 @@ sidebar_label: markdown
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/nim.md

@@ -23,6 +23,7 @@ sidebar_label: nim
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/nodejs-express-server.md

@@ -24,6 +24,7 @@ sidebar_label: nodejs-express-server
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/nodejs-server-deprecated.md

@@ -26,6 +26,7 @@ sidebar_label: nodejs-server-deprecated
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/ocaml.md

@@ -22,6 +22,7 @@ sidebar_label: ocaml
 |Date|java.util.Date|
 |DateTime|org.joda.time.*|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/openapi-yaml.md

@@ -24,6 +24,7 @@ sidebar_label: openapi-yaml
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/openapi.md

@@ -23,6 +23,7 @@ sidebar_label: openapi
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/php-laravel.md

@@ -30,6 +30,7 @@ sidebar_label: php-laravel
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/php-lumen.md

@@ -30,6 +30,7 @@ sidebar_label: php-lumen
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/php-silex-deprecated.md

@@ -23,6 +23,7 @@ sidebar_label: php-silex-deprecated
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/php-ze-ph.md

@@ -30,6 +30,7 @@ sidebar_label: php-ze-ph
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/plantuml.md

@@ -23,6 +23,7 @@ sidebar_label: plantuml
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/powershell-experimental.md

@@ -23,6 +23,7 @@ sidebar_label: powershell-experimental
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/powershell.md

@@ -23,6 +23,7 @@ sidebar_label: powershell
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/python-aiohttp.md

@@ -31,6 +31,7 @@ sidebar_label: python-aiohttp
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/python-blueplanet.md

@@ -31,6 +31,7 @@ sidebar_label: python-blueplanet
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/python-flask.md

@@ -31,6 +31,7 @@ sidebar_label: python-flask
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/ruby-on-rails.md

@@ -18,6 +18,7 @@ sidebar_label: ruby-on-rails
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/ruby-sinatra.md

@@ -17,6 +17,7 @@ sidebar_label: ruby-sinatra
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/rust.md

@@ -22,6 +22,7 @@ sidebar_label: rust
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|

docs/generators/spring.md

@@ -78,6 +78,7 @@ sidebar_label: spring
 |DateTime|org.joda.time.*|
 |File|java.io.File|
 |HashMap|java.util.HashMap|
+|LinkedHashSet|java.util.LinkedHashSet|
 |List|java.util.*|
 |LocalDate|org.joda.time.*|
 |LocalDateTime|org.joda.time.*|
@@ -95,6 +96,7 @@ sidebar_label: spring
 | ---------- | --------------- |
 |array|ArrayList|
 |map|HashMap|
+|set|LinkedHashSet|
 
 
 ## LANGUAGE PRIMITIVES

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenOperation.java

@@ -29,7 +29,7 @@ public class CodegenOperation {
             isListContainer, isMultipart, hasMore = true,
             isResponseBinary = false, isResponseFile = false, hasReference = false,
             isRestfulIndex, isRestfulShow, isRestfulCreate, isRestfulUpdate, isRestfulDestroy,
-            isRestful, isDeprecated, isCallbackRequest;
+            isRestful, isDeprecated, isCallbackRequest, uniqueItems;
     public String path, operationId, returnType, httpMethod, returnBaseType,
             returnContainer, summary, unescapedNotes, notes, baseName, defaultResponse;
     public CodegenDiscriminator discriminator;
@@ -270,6 +270,7 @@ public class CodegenOperation {
         sb.append(", isRestful=").append(isRestful);
         sb.append(", isDeprecated=").append(isDeprecated);
         sb.append(", isCallbackRequest=").append(isCallbackRequest);
+        sb.append(", uniqueItems='").append(uniqueItems);
         sb.append(", path='").append(path).append('\'');
         sb.append(", operationId='").append(operationId).append('\'');
         sb.append(", returnType='").append(returnType).append('\'');
@@ -343,6 +344,7 @@ public class CodegenOperation {
                 isRestful == that.isRestful &&
                 isDeprecated == that.isDeprecated &&
                 isCallbackRequest == that.isCallbackRequest &&
+                uniqueItems == that.uniqueItems &&
                 Objects.equals(responseHeaders, that.responseHeaders) &&
                 Objects.equals(path, that.path) &&
                 Objects.equals(operationId, that.operationId) &&
@@ -393,9 +395,9 @@ public class CodegenOperation {
                 hasRequiredParams, returnTypeIsPrimitive, returnSimpleType, subresourceOperation, isMapContainer,
                 isListContainer, isMultipart, hasMore, isResponseBinary, isResponseFile, hasReference, isRestfulIndex,
                 isRestfulShow, isRestfulCreate, isRestfulUpdate, isRestfulDestroy, isRestful, isDeprecated,
-                isCallbackRequest, path, operationId, returnType, httpMethod, returnBaseType, returnContainer,
+                isCallbackRequest, uniqueItems, path, operationId, returnType, httpMethod, returnBaseType,
-                summary, unescapedNotes, notes, baseName, defaultResponse, discriminator, consumes, produces,
+                returnContainer, summary, unescapedNotes, notes, baseName, defaultResponse, discriminator, consumes,
-                prioritizedContentTypes, servers, bodyParam, allParams, bodyParams, pathParams, queryParams,
+                produces, prioritizedContentTypes, servers, bodyParam, allParams, bodyParams, pathParams, queryParams,
                 headerParams, formParams, cookieParams, requiredParams, optionalParams, authMethods, tags,
                 responses, callbacks, imports, examples, requestBodyExamples, externalDocs, vendorExtensions,
                 nickname, operationIdOriginal, operationIdLowerCase, operationIdCamelCase, operationIdSnakeCase);

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -1378,8 +1378,10 @@ public class DefaultCodegen implements CodegenConfig {
 
         typeMapping = new HashMap<String, String>();
         typeMapping.put("array", "List");
+        typeMapping.put("set", "Set");
         typeMapping.put("map", "Map");
         typeMapping.put("List", "List");
+        typeMapping.put("Set", "Set");
         typeMapping.put("boolean", "Boolean");
         typeMapping.put("string", "String");
         typeMapping.put("int", "Integer");
@@ -1418,6 +1420,7 @@ public class DefaultCodegen implements CodegenConfig {
         importMapping.put("ArrayList", "java.util.ArrayList");
         importMapping.put("List", "java.util.*");
         importMapping.put("Set", "java.util.*");
+        importMapping.put("LinkedHashSet", "java.util.LinkedHashSet");
         importMapping.put("DateTime", "org.joda.time.*");
         importMapping.put("LocalDateTime", "org.joda.time.*");
         importMapping.put("LocalDate", "org.joda.time.*");
@@ -1588,7 +1591,13 @@ public class DefaultCodegen implements CodegenConfig {
         } else if (ModelUtils.isArraySchema(schema)) {
             ArraySchema arraySchema = (ArraySchema) schema;
             String inner = getSchemaType(getSchemaItems(arraySchema));
-            return instantiationTypes.get("array") + "<" + inner + ">";
+            String parentType;
+            if (ModelUtils.isSet(schema)) {
+                parentType = "set";
+            } else {
+                parentType = "array";
+            }
+            return instantiationTypes.get(parentType) + "<" + inner + ">";
         } else {
             return null;
         }
@@ -1979,7 +1988,11 @@ public class DefaultCodegen implements CodegenConfig {
         } else if (ModelUtils.isMapSchema(schema)) {
             return "map";
         } else if (ModelUtils.isArraySchema(schema)) {
-            return "array";
+            if (ModelUtils.isSet(schema)) {
+                return "set";
+            } else {
+                return "array";
+            }
         } else if (ModelUtils.isUUIDSchema(schema)) {
             return "UUID";
         } else if (ModelUtils.isURISchema(schema)) {
@@ -3110,7 +3123,11 @@ public class DefaultCodegen implements CodegenConfig {
         if (ModelUtils.isArraySchema(p)) {
             property.isContainer = true;
             property.isListContainer = true;
-            property.containerType = "array";
+            if (ModelUtils.isSet(p)) {
+                property.containerType = "set";
+            } else {
+                property.containerType = "array";
+            }
             property.baseType = getSchemaType(p);
             if (p.getXml() != null) {
                 property.isXmlWrapped = p.getXml().getWrapped() == null ? false : p.getXml().getWrapped();
@@ -3430,6 +3447,8 @@ public class DefaultCodegen implements CodegenConfig {
                     op.isListContainer = true;
                 } else if ("array".equalsIgnoreCase(cm.containerType)) {
                     op.isListContainer = true;
+                } else if ("set".equalsIgnoreCase(cm.containerType)) {
+                    op.isListContainer = true;
                 }
             } else {
                 op.returnSimpleType = true;
@@ -3521,6 +3540,10 @@ public class DefaultCodegen implements CodegenConfig {
                         !languageSpecificPrimitives.contains(r.baseType)) {
                     imports.add(r.baseType);
                 }
+                if ("set".equals(r.containerType) && typeMapping.containsKey(r.containerType)) {
+                    op.uniqueItems = true;
+                    imports.add(typeMapping.get(r.containerType));
+                }
                 r.isDefault = response == methodResponse;
                 op.responses.add(r);
                 if (Boolean.TRUE.equals(r.isBinary) && Boolean.TRUE.equals(r.isDefault)) {
@@ -3868,7 +3891,9 @@ public class DefaultCodegen implements CodegenConfig {
                 r.simpleType = false;
                 r.containerType = cp.containerType;
                 r.isMapContainer = "map".equals(cp.containerType);
-                r.isListContainer = "list".equalsIgnoreCase(cp.containerType) || "array".equalsIgnoreCase(cp.containerType);
+                r.isListContainer = "list".equalsIgnoreCase(cp.containerType) ||
+                    "array".equalsIgnoreCase(cp.containerType) ||
+                    "set".equalsIgnoreCase(cp.containerType);
             } else {
                 r.simpleType = true;
             }
@@ -4099,6 +4124,9 @@ public class DefaultCodegen implements CodegenConfig {
             if (ModelUtils.isObjectSchema(parameterSchema)) {
                 codegenProperty.complexType = codegenParameter.dataType;
             }
+            if (ModelUtils.isSet(parameterSchema)) {
+                imports.add(codegenProperty.baseType);
+            }
             codegenParameter.dataFormat = codegenProperty.dataFormat;
             codegenParameter.required = codegenProperty.required;
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -18,6 +18,7 @@
 package org.openapitools.codegen.languages;
 
 import com.google.common.base.Strings;
+
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.PathItem;
@@ -166,6 +167,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
                         "byte[]")
         );
         instantiationTypes.put("array", "ArrayList");
+        instantiationTypes.put("set", "LinkedHashSet");
         instantiationTypes.put("map", "HashMap");
         typeMapping.put("date", "Date");
         typeMapping.put("file", "File");
@@ -431,9 +433,11 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         additionalProperties.put("modelDocPath", modelDocPath);
 
         importMapping.put("List", "java.util.List");
+        importMapping.put("Set", "java.util.Set");
 
         if (fullJavaUtil) {
             typeMapping.put("array", "java.util.List");
+            typeMapping.put("set", "java.util.Set");
             typeMapping.put("map", "java.util.Map");
             typeMapping.put("DateTime", "java.util.Date");
             typeMapping.put("UUID", "java.util.UUID");
@@ -448,6 +452,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             importMapping.remove("DateTime");
             importMapping.remove("UUID");
             instantiationTypes.put("array", "java.util.ArrayList");
+            instantiationTypes.put("set", "java.util.LinkedHashSet");
             instantiationTypes.put("map", "java.util.HashMap");
         }
 
@@ -779,10 +784,18 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         schema = ModelUtils.getReferencedSchema(this.openAPI, schema);
         if (ModelUtils.isArraySchema(schema)) {
             final String pattern;
-            if (fullJavaUtil) {
+            if (ModelUtils.isSet(schema)) {
-                pattern = "new java.util.ArrayList<%s>()";
+                if (fullJavaUtil) {
+                    pattern = "new java.util.LinkedHashSet<%s>()";
+                } else {
+                    pattern = "new LinkedHashSet<%s>()";
+                }
             } else {
-                pattern = "new ArrayList<%s>()";
+                if (fullJavaUtil) {
+                    pattern = "new java.util.ArrayList<%s>()";
+                } else {
+                    pattern = "new ArrayList<%s>()";
+                }
             }
 
             Schema<?> items = getSchemaItems((ArraySchema) schema);
@@ -1041,6 +1054,8 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         if (!fullJavaUtil) {
             if ("array".equals(property.containerType)) {
                 model.imports.add("ArrayList");
+            } else if ("set".equals(property.containerType)) {
+                model.imports.add("LinkedHashSet");
             } else if ("map".equals(property.containerType)) {
                 model.imports.add("HashMap");
             }

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaJAXRSServerCodegen.java

@@ -201,6 +201,8 @@ public abstract class AbstractJavaJAXRSServerCodegen extends AbstractJavaCodegen
 
                         if ("array".equals(resp.containerType)) {
                             resp.containerType = "List";
+                        } else if ("set".equals(resp.containerType)) {
+                            resp.containerType = "Set";
                         } else if ("map".equals(resp.containerType)) {
                             resp.containerType = "Map";
                         }
@@ -216,6 +218,8 @@ public abstract class AbstractJavaJAXRSServerCodegen extends AbstractJavaCodegen
 
                 if ("array".equals(operation.returnContainer)) {
                     operation.returnContainer = "List";
+                } else if ("set".equals(operation.returnContainer)) {
+                    operation.returnContainer = "Set";
                 } else if ("map".equals(operation.returnContainer)) {
                     operation.returnContainer = "Map";
                 }

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java

@@ -77,6 +77,7 @@ abstract public class AbstractRubyCodegen extends DefaultCodegen implements Code
         typeMapping.put("date", "Date");
         typeMapping.put("DateTime", "DateTime");
         typeMapping.put("array", "Array");
+        typeMapping.put("set", "Array");
         typeMapping.put("List", "Array");
         typeMapping.put("map", "Hash");
         typeMapping.put("object", "Object");

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java

@@ -741,7 +741,8 @@ public class ElixirClientCodegen extends DefaultCodegen implements CodegenConfig
                 sb.append(returnBaseType);
                 sb.append(".t");
             } else {
-                if (returnContainer.equals("array")) {
+                if (returnContainer.equals("array") ||
+                    returnContainer.equals("set")) {
                     sb.append("list(");
                     if (!returnTypeIsPrimitive) {
                         sb.append(moduleName);

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavascriptClientCodegen.java

@@ -139,10 +139,12 @@ public class JavascriptClientCodegen extends DefaultCodegen implements CodegenCo
         defaultIncludes = new HashSet<String>(languageSpecificPrimitives);
 
         instantiationTypes.put("array", "Array");
+        instantiationTypes.put("set", "Array");
         instantiationTypes.put("list", "Array");
         instantiationTypes.put("map", "Object");
         typeMapping.clear();
         typeMapping.put("array", "Array");
+        typeMapping.put("set", "Array");
         typeMapping.put("map", "Object");
         typeMapping.put("List", "Array");
         typeMapping.put("boolean", "Boolean");
@@ -923,7 +925,7 @@ public class JavascriptClientCodegen extends DefaultCodegen implements CodegenCo
 
     private String getJSDocType(CodegenModel cm, CodegenProperty cp) {
         if (Boolean.TRUE.equals(cp.isContainer)) {
-            if (cp.containerType.equals("array"))
+            if (cp.containerType.equals("array") || cp.containerType.equals("set"))
                 return "Array.<" + getJSDocType(cm, cp.items) + ">";
             else if (cp.containerType.equals("map"))
                 return "Object.<String, " + getJSDocType(cm, cp.items) + ">";

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/MysqlSchemaCodegen.java

@@ -155,6 +155,7 @@ public class MysqlSchemaCodegen extends DefaultCodegen implements CodegenConfig
 
         // https://dev.mysql.com/doc/refman/8.0/en/data-types.html
         typeMapping.put("array", "JSON");
+        typeMapping.put("set", "JSON");
         typeMapping.put("map", "JSON");
         typeMapping.put("List", "JSON");
         typeMapping.put("boolean", "BOOL");

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PerlClientCodegen.java

@@ -131,6 +131,7 @@ public class PerlClientCodegen extends DefaultCodegen implements CodegenConfig {
         typeMapping.put("DateTime", "DateTime");
         typeMapping.put("password", "string");
         typeMapping.put("array", "ARRAY");
+        typeMapping.put("set", "ARRAY");
         typeMapping.put("map", "HASH");
         typeMapping.put("object", "object");
         typeMapping.put("binary", "string");

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java

@@ -128,6 +128,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
         typeMapping.put("long", "int");
         typeMapping.put("double", "float");
         typeMapping.put("array", "list");
+        typeMapping.put("set", "list");
         typeMapping.put("map", "dict");
         typeMapping.put("boolean", "bool");
         typeMapping.put("string", "str");

modules/openapi-generator/src/main/resources/JavaJaxRS/resteasy/returnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/JavaJaxRS/returnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/JavaPlayFramework/exampleReturnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map{{/isMapContainer}}{{#isListContainer}}List{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/JavaPlayFramework/newApi.mustache

@@ -7,6 +7,7 @@ import play.mvc.Http;
 import java.util.List;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.LinkedHashSet;
 import java.io.FileInputStream;
 {{#useBeanValidation}}
 import javax.validation.constraints.*;

modules/openapi-generator/src/main/resources/JavaPlayFramework/newApiController.mustache

@@ -9,6 +9,7 @@ import play.mvc.Http;
 import java.util.List;
 import java.util.Map;
 import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.google.inject.Inject;
@@ -102,7 +103,7 @@ public class {{classname}}Controller extends Controller {
         }
         {{/required}}
         List<String> {{paramName}}List = OpenAPIUtils.parametersToList("{{collectionFormat}}", {{paramName}}Array);
-        {{{dataType}}} {{paramName}} = new Array{{{dataType}}}();
+        {{{dataType}}} {{paramName}} = new {{#uniqueItems}}LinkedHashSet{{/uniqueItems}}{{^uniqueItems}}ArrayList{{/uniqueItems}}<>();
         for (String curParam : {{paramName}}List) {
             if (!curParam.isEmpty()) {
                 //noinspection UseBulkOperation
@@ -143,7 +144,7 @@ public class {{classname}}Controller extends Controller {
         }
         {{/required}}
         List<String> {{paramName}}List = OpenAPIUtils.parametersToList("{{collectionFormat}}", {{paramName}}Array);
-        {{{dataType}}} {{paramName}} = new Array{{{dataType}}}();
+        {{{dataType}}} {{paramName}} = new {{#uniqueItems}}LinkedHashSet{{/uniqueItems}}{{^uniqueItems}}ArrayList{{/uniqueItems}}<>();
         for (String curParam : {{paramName}}List) {
             if (!curParam.isEmpty()) {
                 //noinspection UseBulkOperation
@@ -176,7 +177,7 @@ public class {{classname}}Controller extends Controller {
         }
         {{/required}}
         List<String> {{paramName}}List = OpenAPIUtils.parametersToList("{{collectionFormat}}", {{paramName}}Array);
-        {{{dataType}}} {{paramName}} = new Array{{{dataType}}}();
+        {{{dataType}}} {{paramName}} = new {{#uniqueItems}}LinkedHashSet{{/uniqueItems}}{{^uniqueItems}}ArrayList{{/uniqueItems}}<>();
         for (String curParam : {{paramName}}List) {
             if (!curParam.isEmpty()) {
                 //noinspection UseBulkOperation

modules/openapi-generator/src/main/resources/JavaPlayFramework/returnTypes.mustache

@@ -1 +1 @@
-{{#returnType}}{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}{{^returnType}}void{{/returnType}}
+{{#returnType}}{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}{{^returnType}}void{{/returnType}}

modules/openapi-generator/src/main/resources/JavaPlayFramework/returnTypesNoVoid.mustache

@@ -1 +1 @@
-{{#returnType}}{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}
+{{#returnType}}{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}

modules/openapi-generator/src/main/resources/JavaPlayFramework/returnTypesNoVoidNoAbstract.mustache

@@ -1 +1 @@
-{{#returnType}}{{#returnContainer}}{{#isMapContainer}}HashMap<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}ArrayList<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}
+{{#returnType}}{{#returnContainer}}{{#isMapContainer}}HashMap<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{#uniqueItems}}LinkedHashSet{{/uniqueItems}}{{^uniqueItems}}ArrayList{{/uniqueItems}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}{{/returnType}}

modules/openapi-generator/src/main/resources/JavaSpring/exampleReturnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map<String, {{/isMapContainer}}{{#isListContainer}}List<{{/isListContainer}}{{{returnType}}}>{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map<String, {{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{/isListContainer}}{{{returnType}}}>{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/JavaSpring/returnTypes.mustache

@@ -1 +1 @@
-{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{#reactive}}Flux{{/reactive}}{{^reactive}}List{{/reactive}}<{{{returnType}}}>{{/isListContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{#reactive}}Flux{{/reactive}}{{^reactive}}{{{returnContainer}}}{{/reactive}}<{{{returnType}}}>{{/isListContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/java-msf4j-server/returnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/java-pkmst/exampleReturnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map{{/isMapContainer}}{{#isListContainer}}List{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/java-pkmst/returnTypes.mustache

@@ -1 +1 @@
-{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}List<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#returnContainer}}{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{{returnContainer}}}<{{{returnType}}}>{{/isListContainer}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/main/resources/kotlin-spring/returnTypes.mustache

@@ -1 +1 @@
-{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{#reactive}}Flow{{/reactive}}{{^reactive}}List{{/reactive}}<{{{returnType}}}>{{/isListContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}
+{{#isMapContainer}}Map<String, {{{returnType}}}>{{/isMapContainer}}{{#isListContainer}}{{#reactive}}Flow{{/reactive}}{{^reactive}}{{{returnContainer}}}{{/reactive}}<{{{returnType}}}>{{/isListContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenTest.java

@@ -446,6 +446,18 @@ public class AbstractJavaCodegenTest {
         defaultValue = codegen.getTypeDeclaration(schema);
         Assert.assertEquals(defaultValue, "List<NestedArray>");
 
+        // Create an array schema with item type set to the array alias
+        schema = new ArraySchema().items(new Schema().$ref("#/components/schemas/NestedArray"));
+        schema.setUniqueItems(true);
+
+        ModelUtils.setGenerateAliasAsModel(false);
+        defaultValue = codegen.getTypeDeclaration(schema);
+        Assert.assertEquals(defaultValue, "Set<List<Integer>>");
+
+        ModelUtils.setGenerateAliasAsModel(true);
+        defaultValue = codegen.getTypeDeclaration(schema);
+        Assert.assertEquals(defaultValue, "Set<NestedArray>");
+
         // Create a map schema with additionalProperties type set to array alias
         schema = new MapSchema().additionalProperties(new Schema().$ref("#/components/schemas/NestedArray"));
 

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaModelTest.java

@@ -110,11 +110,11 @@ public class JavaModelTest {
     @Test(description = "convert a model with list property")
     public void listPropertyTest() {
         final Schema schema = new Schema()
-                .description("a sample model")
+            .description("a sample model")
-                .addProperties("id", new IntegerSchema().format(SchemaTypeUtil.INTEGER64_FORMAT))
+            .addProperties("id", new IntegerSchema().format(SchemaTypeUtil.INTEGER64_FORMAT))
-                .addProperties("urls", new ArraySchema()
+            .addProperties("urls", new ArraySchema()
-                        .items(new StringSchema()))
+                .items(new StringSchema()))
-                .addRequiredItem("id");
+            .addRequiredItem("id");
         final DefaultCodegen codegen = new JavaClientCodegen();
         OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", schema);
         codegen.setOpenAPI(openAPI);
@@ -138,6 +138,38 @@ public class JavaModelTest {
         Assert.assertTrue(property.isContainer);
     }
 
+    @Test(description = "convert a model with set property")
+    public void setPropertyTest() {
+        final Schema schema = new Schema()
+            .description("a sample model")
+            .addProperties("id", new IntegerSchema().format(SchemaTypeUtil.INTEGER64_FORMAT))
+            .addProperties("urls", new ArraySchema()
+                .items(new StringSchema())
+                .uniqueItems(true))
+            .addRequiredItem("id");
+        final DefaultCodegen codegen = new JavaClientCodegen();
+        OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", schema);
+        codegen.setOpenAPI(openAPI);
+        final CodegenModel cm = codegen.fromModel("sample", schema);
+
+        Assert.assertEquals(cm.name, "sample");
+        Assert.assertEquals(cm.classname, "Sample");
+        Assert.assertEquals(cm.description, "a sample model");
+        Assert.assertEquals(cm.vars.size(), 2);
+
+        final CodegenProperty property = cm.vars.get(1);
+        Assert.assertEquals(property.baseName, "urls");
+        Assert.assertEquals(property.getter, "getUrls");
+        Assert.assertEquals(property.setter, "setUrls");
+        Assert.assertEquals(property.dataType, "Set<String>");
+        Assert.assertEquals(property.name, "urls");
+        Assert.assertEquals(property.defaultValue, "new LinkedHashSet<String>()");
+        Assert.assertEquals(property.baseType, "Set");
+        Assert.assertEquals(property.containerType, "set");
+        Assert.assertFalse(property.required);
+        Assert.assertTrue(property.isContainer);
+    }
+
     @Test(description = "convert a model with a map property")
     public void mapPropertyTest() {
         final Schema schema = new Schema()
@@ -401,6 +433,27 @@ public class JavaModelTest {
         Assert.assertEquals(Sets.intersection(cm.imports, Sets.newHashSet("ApiModel", "List", "ArrayList", "Children")).size(), 4);
     }
 
+    @Test(description = "convert a set model")
+    public void setModelTest() {
+        final Schema schema = new ArraySchema()
+                .items(new Schema().name("elobjeto").$ref("#/components/schemas/Children"))
+                .uniqueItems(true)
+                .name("arraySchema")
+                .description("an array model");
+        final DefaultCodegen codegen = new JavaClientCodegen();
+        OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", schema);
+        codegen.setOpenAPI(openAPI);
+        final CodegenModel cm = codegen.fromModel("sample", schema);
+
+        Assert.assertEquals(cm.name, "sample");
+        Assert.assertEquals(cm.classname, "Sample");
+        Assert.assertEquals(cm.description, "an array model");
+        Assert.assertEquals(cm.vars.size(), 0);
+        Assert.assertEquals(cm.parent, "LinkedHashSet<Children>");
+        Assert.assertEquals(cm.imports.size(), 4);
+        Assert.assertEquals(Sets.intersection(cm.imports, Sets.newHashSet("ApiModel", "Set", "LinkedHashSet", "Children")).size(), 4);
+    }
+
     @Test(description = "convert a map model")
     public void mapModelTest() {
         final Schema schema = new Schema()

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSSpecServerCodegenTest.java

@@ -1,8 +1,14 @@
 package org.openapitools.codegen.java.jaxrs;
 
+import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
+import io.swagger.v3.oas.models.media.ArraySchema;
+import io.swagger.v3.oas.models.media.Content;
+import io.swagger.v3.oas.models.media.MediaType;
+import io.swagger.v3.oas.models.responses.ApiResponse;
 import io.swagger.v3.oas.models.servers.Server;
+import io.swagger.v3.parser.core.models.ParseOptions;
 
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConstants;
@@ -13,17 +19,21 @@ import org.openapitools.codegen.config.CodegenConfigurator;
 import org.openapitools.codegen.languages.AbstractJavaJAXRSServerCodegen;
 import org.openapitools.codegen.languages.JavaClientCodegen;
 import org.openapitools.codegen.languages.JavaJAXRSSpecServerCodegen;
+import org.openapitools.codegen.languages.features.CXFServerFeatures;
 import org.testng.Assert;
 import org.testng.annotations.BeforeMethod;
 import org.testng.annotations.Test;
 
 import java.io.File;
+import java.io.IOException;
 import java.nio.file.Files;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import static org.openapitools.codegen.TestUtils.assertFileContains;
 import static org.openapitools.codegen.TestUtils.validateJavaSourceFiles;
+import static org.testng.Assert.assertTrue;
 
 /**
  * Unit-Test for {@link org.openapitools.codegen.languages.JavaJAXRSSpecServerCodegen}.
@@ -123,7 +133,7 @@ public class JavaJAXRSSpecServerCodegenTest extends JavaJaxrsBaseTest {
         codegen.addOperationToGroup("Primaryresource", "/", operation, codegenOperation, operationList);
 
         Assert.assertEquals(operationList.size(), 1);
-        Assert.assertTrue(operationList.containsKey(""));
+        assertTrue(operationList.containsKey(""));
         Assert.assertEquals(codegenOperation.baseName, "Primaryresource");
     }
 
@@ -141,7 +151,7 @@ public class JavaJAXRSSpecServerCodegenTest extends JavaJaxrsBaseTest {
         codegen.addOperationToGroup("Primaryresource", "/{uuid}", operation, codegenOperation, operationList);
 
         Assert.assertEquals(operationList.size(), 1);
-        Assert.assertTrue(operationList.containsKey(""));
+        assertTrue(operationList.containsKey(""));
         Assert.assertEquals(codegenOperation.baseName, "Primaryresource");
     }
 
@@ -161,7 +171,7 @@ public class JavaJAXRSSpecServerCodegenTest extends JavaJaxrsBaseTest {
 
         Assert.assertEquals(codegenOperation.baseName, "subresource");
         Assert.assertEquals(operationList.size(), 1);
-        Assert.assertTrue(operationList.containsKey("subresource"));
+        assertTrue(operationList.containsKey("subresource"));
     }
 
     /**
@@ -312,4 +322,55 @@ public class JavaJAXRSSpecServerCodegenTest extends JavaJaxrsBaseTest {
 
         output.deleteOnExit();
     }
+
+    @Test
+    public void addsImportForSetArgument() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/3_0/arrayParameter.yaml", null, new ParseOptions()).getOpenAPI();
+
+        openAPI.getComponents().getParameters().get("operationsQueryParam").setSchema(new ArraySchema().uniqueItems(true));
+        codegen.setOutputDir(output.getAbsolutePath());
+
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+
+        ClientOptInput input = new ClientOptInput()
+            .openAPI(openAPI)
+            .config(codegen);
+
+        MockDefaultGenerator generator = new MockDefaultGenerator();
+        generator.opts(input).generate();
+
+        String path = outputPath + "/src/gen/java/org/openapitools/api/ExamplesApi.java";
+
+        assertFileContains(generator, path, "\nimport java.util.Set;\n");
+    }
+
+    @Test
+    public void addsImportForSetResponse() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/3_0/setResponse.yaml", null, new ParseOptions()).getOpenAPI();
+
+        codegen.setOutputDir(output.getAbsolutePath());
+
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+
+        ClientOptInput input = new ClientOptInput()
+            .openAPI(openAPI)
+            .config(codegen);
+
+        MockDefaultGenerator generator = new MockDefaultGenerator();
+        generator.opts(input).generate();
+
+        String path = outputPath + "/src/gen/java/org/openapitools/api/ExamplesApi.java";
+
+        assertFileContains(generator, path, "\nimport java.util.Set;\n");
+    }
 }

modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -132,6 +132,7 @@ paths:
           description: Tags to filter by
           required: true
           type: array
+          uniqueItems: true
           items:
             type: string
           collectionFormat: csv
@@ -140,6 +141,7 @@ paths:
           description: successful operation
           schema:
             type: array
+            uniqueItems: true
             items:
               $ref: '#/definitions/Pet'
         '400':
@@ -1234,6 +1236,7 @@ definitions:
         example: doggie
       photoUrls:
         type: array
+        uniqueItems: true
         xml:
           name: photoUrl
           wrapped: true

modules/openapi-generator/src/test/resources/3_0/setResponse.yaml

@@ -0,0 +1,32 @@
+openapi: 3.0.0
+paths:
+  /examples:
+    get:
+      tags:
+        - Examples
+      summary: Get a list of transactions
+      operationId: getFilteredTransactions
+      parameters:
+        - $ref: '#/components/parameters/operationsQueryParam'
+      responses:
+        200:
+          description: A list of deleted consumers
+          content:
+            application/json:
+              schema:
+                type: array
+                uniqueItems: true
+                items:
+                  type: string
+
+components:
+  parameters:
+    operationsQueryParam:
+      name: operations
+      description: Operations list
+      in: query
+      required: false
+      schema:
+        type: array
+        items:
+          type: string

samples/client/petstore/go-experimental/go-petstore/api/openapi.yaml

@@ -139,6 +139,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -148,11 +149,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1323,6 +1326,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/go/go-petstore-withXml/api/openapi.yaml

@@ -139,6 +139,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -148,11 +149,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1323,6 +1326,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/go/go-petstore/api/openapi.yaml

@@ -139,6 +139,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -148,11 +149,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1323,6 +1326,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/haskell-http-client/openapi.yaml

@@ -139,6 +139,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -148,11 +149,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1323,6 +1326,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/java/feign/api/openapi.yaml

@@ -144,6 +144,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -153,11 +154,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1384,6 +1387,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/PetApi.java

@@ -6,6 +6,7 @@ import org.openapitools.client.EncodingUtils;
 import java.io.File;
 import org.openapitools.client.model.ModelApiResponse;
 import org.openapitools.client.model.Pet;
+import java.util.Set;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -90,13 +91,13 @@ public interface PetApi extends ApiClient.Api {
    * Finds Pets by tags
    * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
    * @param tags Tags to filter by (required)
-   * @return List<Pet>
+   * @return Set<Pet>
    */
   @RequestLine("GET /pet/findByTags?tags={tags}")
   @Headers({
     "Accept: application/json",
   })
-  List<Pet> findPetsByTags(@Param("tags") List<String> tags);
+  Set<Pet> findPetsByTags(@Param("tags") Set<String> tags);
 
   /**
    * Finds Pets by tags
@@ -111,20 +112,20 @@ public interface PetApi extends ApiClient.Api {
    *   <ul>
    *   <li>tags - Tags to filter by (required)</li>
    *   </ul>
-   * @return List&lt;Pet&gt;
+   * @return Set&lt;Pet&gt;
    */
   @RequestLine("GET /pet/findByTags?tags={tags}")
   @Headers({
   "Accept: application/json",
   })
-  List<Pet> findPetsByTags(@QueryMap(encoded=true) Map<String, Object> queryParams);
+  Set<Pet> findPetsByTags(@QueryMap(encoded=true) Map<String, Object> queryParams);
 
   /**
    * A convenience class for generating query parameters for the
    * <code>findPetsByTags</code> method in a fluent style.
    */
   public static class FindPetsByTagsQueryParams extends HashMap<String, Object> {
-    public FindPetsByTagsQueryParams tags(final List<String> value) {
+    public FindPetsByTagsQueryParams tags(final Set<String> value) {
       put("tags", EncodingUtils.encodeCollection(value, "csv"));
       return this;
     }

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,7 +22,9 @@ import com.fasterxml.jackson.annotation.JsonValue;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 import org.openapitools.client.model.Category;
 import org.openapitools.client.model.Tag;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -51,7 +53,7 @@ public class Pet {
   private String name;
 
   public static final String JSON_PROPERTY_PHOTO_URLS = "photoUrls";
-  private List<String> photoUrls = new ArrayList<String>();
+  private Set<String> photoUrls = new LinkedHashSet<String>();
 
   public static final String JSON_PROPERTY_TAGS = "tags";
   private List<Tag> tags = null;
@@ -171,7 +173,7 @@ public class Pet {
   }
 
 
-  public Pet photoUrls(List<String> photoUrls) {
+  public Pet photoUrls(Set<String> photoUrls) {
     
     this.photoUrls = photoUrls;
     return this;
@@ -190,12 +192,12 @@ public class Pet {
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
-  public List<String> getPhotoUrls() {
+  public Set<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  public void setPhotoUrls(List<String> photoUrls) {
+  public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }
 

samples/client/petstore/java/feign10x/api/openapi.yaml

@@ -144,6 +144,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -153,11 +154,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1384,6 +1387,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/java/feign10x/src/main/java/org/openapitools/client/api/PetApi.java

@@ -6,6 +6,7 @@ import org.openapitools.client.EncodingUtils;
 import java.io.File;
 import org.openapitools.client.model.ModelApiResponse;
 import org.openapitools.client.model.Pet;
+import java.util.Set;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -90,13 +91,13 @@ public interface PetApi extends ApiClient.Api {
    * Finds Pets by tags
    * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
    * @param tags Tags to filter by (required)
-   * @return List<Pet>
+   * @return Set<Pet>
    */
   @RequestLine("GET /pet/findByTags?tags={tags}")
   @Headers({
     "Accept: application/json",
   })
-  List<Pet> findPetsByTags(@Param("tags") List<String> tags);
+  Set<Pet> findPetsByTags(@Param("tags") Set<String> tags);
 
   /**
    * Finds Pets by tags
@@ -111,20 +112,20 @@ public interface PetApi extends ApiClient.Api {
    *   <ul>
    *   <li>tags - Tags to filter by (required)</li>
    *   </ul>
-   * @return List&lt;Pet&gt;
+   * @return Set&lt;Pet&gt;
    */
   @RequestLine("GET /pet/findByTags?tags={tags}")
   @Headers({
   "Accept: application/json",
   })
-  List<Pet> findPetsByTags(@QueryMap(encoded=true) Map<String, Object> queryParams);
+  Set<Pet> findPetsByTags(@QueryMap(encoded=true) Map<String, Object> queryParams);
 
   /**
    * A convenience class for generating query parameters for the
    * <code>findPetsByTags</code> method in a fluent style.
    */
   public static class FindPetsByTagsQueryParams extends HashMap<String, Object> {
-    public FindPetsByTagsQueryParams tags(final List<String> value) {
+    public FindPetsByTagsQueryParams tags(final Set<String> value) {
       put("tags", EncodingUtils.encodeCollection(value, "csv"));
       return this;
     }

samples/client/petstore/java/feign10x/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,7 +22,9 @@ import com.fasterxml.jackson.annotation.JsonValue;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 import org.openapitools.client.model.Category;
 import org.openapitools.client.model.Tag;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -50,7 +52,7 @@ public class Pet {
   private String name;
 
   public static final String JSON_PROPERTY_PHOTO_URLS = "photoUrls";
-  private List<String> photoUrls = new ArrayList<String>();
+  private Set<String> photoUrls = new LinkedHashSet<String>();
 
   public static final String JSON_PROPERTY_TAGS = "tags";
   private List<Tag> tags = null;
@@ -170,7 +172,7 @@ public class Pet {
   }
 
 
-  public Pet photoUrls(List<String> photoUrls) {
+  public Pet photoUrls(Set<String> photoUrls) {
     
     this.photoUrls = photoUrls;
     return this;
@@ -189,12 +191,12 @@ public class Pet {
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
-  public List<String> getPhotoUrls() {
+  public Set<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  public void setPhotoUrls(List<String> photoUrls) {
+  public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }
 

samples/client/petstore/java/google-api-client/api/openapi.yaml

@@ -144,6 +144,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -153,11 +154,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1384,6 +1387,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/java/google-api-client/docs/Pet.md

@@ -9,7 +9,7 @@ Name | Type | Description | Notes
 **id** | **Long** |  |  [optional]
 **category** | [**Category**](Category.md) |  |  [optional]
 **name** | **String** |  | 
-**photoUrls** | **List<String>** |  | 
+**photoUrls** | **Set<String>** |  | 
 **tags** | [**List<Tag>**](Tag.md) |  |  [optional]
 **status** | [**StatusEnum**](#StatusEnum) | pet status in the store |  [optional]
 

samples/client/petstore/java/google-api-client/docs/PetApi.md

@@ -227,7 +227,7 @@ Name | Type | Description  | Notes
 
 ## findPetsByTags
 
-> List<Pet> findPetsByTags(tags)
+> Set<Pet> findPetsByTags(tags)
 
 Finds Pets by tags
 
@@ -254,9 +254,9 @@ public class Example {
         petstore_auth.setAccessToken("YOUR ACCESS TOKEN");
 
         PetApi apiInstance = new PetApi(defaultClient);
-        List<String> tags = Arrays.asList(); // List<String> | Tags to filter by
+        Set<String> tags = Arrays.asList(); // Set<String> | Tags to filter by
         try {
-            List<Pet> result = apiInstance.findPetsByTags(tags);
+            Set<Pet> result = apiInstance.findPetsByTags(tags);
             System.out.println(result);
         } catch (ApiException e) {
             System.err.println("Exception when calling PetApi#findPetsByTags");
@@ -274,11 +274,11 @@ public class Example {
 
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
- **tags** | [**List&lt;String&gt;**](String.md)| Tags to filter by |
+ **tags** | [**Set&lt;String&gt;**](String.md)| Tags to filter by |
 
 ### Return type
 
-[**List&lt;Pet&gt;**](Pet.md)
+[**Set&lt;Pet&gt;**](Pet.md)
 
 ### Authorization
 

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/api/PetApi.java

@@ -5,6 +5,7 @@ import org.openapitools.client.ApiClient;
 import java.io.File;
 import org.openapitools.client.model.ModelApiResponse;
 import org.openapitools.client.model.Pet;
+import java.util.Set;
 
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.google.api.client.http.EmptyContent;
@@ -303,12 +304,12 @@ public class PetApi {
     * <p><b>200</b> - successful operation
     * <p><b>400</b> - Invalid tag value
     * @param tags Tags to filter by
-    * @return List&lt;Pet&gt;
+    * @return Set&lt;Pet&gt;
     * @throws IOException if an error occurs while attempting to invoke the API
     **/
-    public List<Pet> findPetsByTags(List<String> tags) throws IOException {
+    public Set<Pet> findPetsByTags(Set<String> tags) throws IOException {
         HttpResponse response = findPetsByTagsForHttpResponse(tags);
-        TypeReference<List<Pet>> typeRef = new TypeReference<List<Pet>>() {};
+        TypeReference<Set<Pet>> typeRef = new TypeReference<Set<Pet>>() {};
         return apiClient.getObjectMapper().readValue(response.getContent(), typeRef);
     }
 
@@ -319,16 +320,16 @@ public class PetApi {
     * <p><b>400</b> - Invalid tag value
     * @param tags Tags to filter by
     * @param params Map of query params. A collection will be interpreted as passing in multiple instances of the same query param.
-    * @return List&lt;Pet&gt;
+    * @return Set&lt;Pet&gt;
     * @throws IOException if an error occurs while attempting to invoke the API
     **/
-    public List<Pet> findPetsByTags(List<String> tags, Map<String, Object> params) throws IOException {
+    public Set<Pet> findPetsByTags(Set<String> tags, Map<String, Object> params) throws IOException {
         HttpResponse response = findPetsByTagsForHttpResponse(tags, params);
-        TypeReference<List<Pet>> typeRef = new TypeReference<List<Pet>>() {};
+        TypeReference<Set<Pet>> typeRef = new TypeReference<Set<Pet>>() {};
         return apiClient.getObjectMapper().readValue(response.getContent(), typeRef);
     }
 
-    public HttpResponse findPetsByTagsForHttpResponse(List<String> tags) throws IOException {
+    public HttpResponse findPetsByTagsForHttpResponse(Set<String> tags) throws IOException {
         // verify the required parameter 'tags' is set
         if (tags == null) {
             throw new IllegalArgumentException("Missing the required parameter 'tags' when calling findPetsByTags");
@@ -353,7 +354,7 @@ public class PetApi {
         return apiClient.getHttpRequestFactory().buildRequest(HttpMethods.GET, genericUrl, content).execute();
     }
 
-    public HttpResponse findPetsByTagsForHttpResponse(List<String> tags, Map<String, Object> params) throws IOException {
+    public HttpResponse findPetsByTagsForHttpResponse(Set<String> tags, Map<String, Object> params) throws IOException {
         // verify the required parameter 'tags' is set
         if (tags == null) {
             throw new IllegalArgumentException("Missing the required parameter 'tags' when calling findPetsByTags");

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,7 +22,9 @@ import com.fasterxml.jackson.annotation.JsonValue;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 import org.openapitools.client.model.Category;
 import org.openapitools.client.model.Tag;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -50,7 +52,7 @@ public class Pet {
   private String name;
 
   public static final String JSON_PROPERTY_PHOTO_URLS = "photoUrls";
-  private List<String> photoUrls = new ArrayList<String>();
+  private Set<String> photoUrls = new LinkedHashSet<String>();
 
   public static final String JSON_PROPERTY_TAGS = "tags";
   private List<Tag> tags = null;
@@ -170,7 +172,7 @@ public class Pet {
   }
 
 
-  public Pet photoUrls(List<String> photoUrls) {
+  public Pet photoUrls(Set<String> photoUrls) {
     
     this.photoUrls = photoUrls;
     return this;
@@ -189,12 +191,12 @@ public class Pet {
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
-  public List<String> getPhotoUrls() {
+  public Set<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  public void setPhotoUrls(List<String> photoUrls) {
+  public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }
 

samples/client/petstore/java/google-api-client/src/test/java/org/openapitools/client/api/PetApiTest.java

@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * API tests for PetApi
@@ -93,8 +94,8 @@ public class PetApiTest {
      */
     @Test
     public void findPetsByTagsTest() throws IOException {
-        List<String> tags = null;
+        Set<String> tags = null;
-        List<Pet> response = api.findPetsByTags(tags);
+        Set<Pet> response = api.findPetsByTags(tags);
 
         // TODO: test validations
     }

samples/client/petstore/java/jersey1/api/openapi.yaml

@@ -144,6 +144,7 @@ paths:
           items:
             type: string
           type: array
+          uniqueItems: true
         style: form
       responses:
         "200":
@@ -153,11 +154,13 @@ paths:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
             application/json:
               schema:
                 items:
                   $ref: '#/components/schemas/Pet'
                 type: array
+                uniqueItems: true
           description: successful operation
         "400":
           content: {}
@@ -1384,6 +1387,7 @@ components:
           items:
             type: string
           type: array
+          uniqueItems: true
           xml:
             name: photoUrl
             wrapped: true

samples/client/petstore/java/jersey1/docs/Pet.md

@@ -9,7 +9,7 @@ Name | Type | Description | Notes
 **id** | **Long** |  |  [optional]
 **category** | [**Category**](Category.md) |  |  [optional]
 **name** | **String** |  | 
-**photoUrls** | **List<String>** |  | 
+**photoUrls** | **Set<String>** |  | 
 **tags** | [**List<Tag>**](Tag.md) |  |  [optional]
 **status** | [**StatusEnum**](#StatusEnum) | pet status in the store |  [optional]