[feature][dart] Add support for uniqueItems/sets (#8375)

* [dart][dart-dio] Add support for set types * copy `uniqueItems` usage from 2.0 fake spec to `3.0` * add support for sets in parameters, responses and properties * Regenerate all other samples * Fix broken tests due to invalid cast * Update documentation * Regenerate samples * update samples Co-authored-by: William Cheng <wing328hk@gmail.com>
2021-02-02 11:42:45 +01:00
parent f01ee4a8d2
commit 769b0e0e38
51 changed files with 219 additions and 86 deletions
--- a/docs/generators/dart-dio.md
+++ b/docs/generators/dart-dio.md
@@ -41,8 +41,6 @@ These options may be applied as additional-properties (cli) or configOptions (pl

 | Type/Alias | Instantiated By |
 | ---------- | --------------- |
-|array|List|
-|map|Map|


 ## LANGUAGE PRIMITIVES
--- a/docs/generators/dart-jaguar.md
+++ b/docs/generators/dart-jaguar.md
@@ -36,8 +36,6 @@ These options may be applied as additional-properties (cli) or configOptions (pl

 | Type/Alias | Instantiated By |
 | ---------- | --------------- |
-|array|List|
-|map|Map|


 ## LANGUAGE PRIMITIVES
--- a/docs/generators/dart.md
+++ b/docs/generators/dart.md
@@ -34,8 +34,6 @@ These options may be applied as additional-properties (cli) or configOptions (pl

 | Type/Alias | Instantiated By |
 | ---------- | --------------- |
-|array|List|
-|map|Map|


 ## LANGUAGE PRIMITIVES
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java
@@ -141,14 +141,13 @@ public class DartClientCodegen extends DefaultCodegen {
            "double",
            "dynamic"
        );
-        instantiationTypes.put("array", "List");
-        instantiationTypes.put("map", "Map");

        typeMapping = new HashMap<>();
        typeMapping.put("Array", "List");
        typeMapping.put("array", "List");
        typeMapping.put("map", "Map");
        typeMapping.put("List", "List");
+        typeMapping.put("set", "Set");
        typeMapping.put("boolean", "bool");
        typeMapping.put("string", "String");
        typeMapping.put("char", "String");
@@ -468,9 +467,10 @@ public class DartClientCodegen extends DefaultCodegen {

    @Override
    public String toDefaultValue(Schema schema) {
-        if (ModelUtils.isMapSchema(schema)) {
+        if (ModelUtils.isMapSchema(schema) || ModelUtils.isSet(schema)) {
            return "const {}";
-        } else if (ModelUtils.isArraySchema(schema)) {
+        }
+        if (ModelUtils.isArraySchema(schema)) {
            return "const []";
        }

@@ -494,7 +494,8 @@ public class DartClientCodegen extends DefaultCodegen {
        if (ModelUtils.isArraySchema(target)) {
            Schema<?> items = getSchemaItems((ArraySchema) schema);
            return getSchemaType(target) + "<" + getTypeDeclaration(items) + ">";
-        } else if (ModelUtils.isMapSchema(target)) {
+        }
+        if (ModelUtils.isMapSchema(target)) {
            // Note: ModelUtils.isMapSchema(p) returns true when p is a composed schema that also defines
            // additionalproperties: true
            Schema<?> inner = getAdditionalProperties(target);
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioClientCodegen.java
@@ -127,6 +127,9 @@ public class DartDioClientCodegen extends DartClientCodegen {
    public String toDefaultValue(Schema schema) {
        if (schema.getDefault() != null) {
            if (ModelUtils.isArraySchema(schema)) {
+                if (ModelUtils.isSet(schema)) {
+                    return "SetBuilder()";
+                }
                return "ListBuilder()";
            }
            if (ModelUtils.isMapSchema(schema)) {
@@ -318,6 +321,7 @@ public class DartDioClientCodegen extends DartClientCodegen {
                if (param.isContainer) {
                    final Map<String, Object> serializer = new HashMap<>();
                    serializer.put("isArray", param.isArray);
+                    serializer.put("uniqueItems", param.uniqueItems);
                    serializer.put("isMap", param.isMap);
                    serializer.put("baseType", param.baseType);
                    serializers.add(serializer);
@@ -347,7 +351,8 @@ public class DartDioClientCodegen extends DartClientCodegen {

            if (op.returnContainer != null) {
                final Map<String, Object> serializer = new HashMap<>();
-                serializer.put("isArray", Objects.equals("array", op.returnContainer));
+                serializer.put("isArray", Objects.equals("array", op.returnContainer) || Objects.equals("set", op.returnContainer));
+                serializer.put("uniqueItems", op.uniqueItems);
                serializer.put("isMap", Objects.equals("map", op.returnContainer));
                serializer.put("baseType", op.returnBaseType);
                serializers.add(serializer);
--- a/modules/openapi-generator/src/main/resources/dart-dio/api.mustache
+++ b/modules/openapi-generator/src/main/resources/dart-dio/api.mustache
@@ -69,7 +69,7 @@ class {{classname}} {

        {{#isContainer}}
        {{#isArray}}
-        const type = FullType(BuiltList, [FullType({{baseType}})]);
+        const type = FullType(Built{{#uniqueItems}}Built{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}, [FullType({{baseType}})]);
        final serializedBody = _serializers.serialize({{paramName}}, specifiedType: type);
        {{/isArray}}
        {{#isMap}}
@@ -135,8 +135,7 @@ class {{classname}} {
        {{/returnTypeIsPrimitive}}
        {{/returnSimpleType}}
        {{^returnSimpleType}}
-            const collectionType = {{#isMap}}BuiltMap{{/isMap}}{{^isMap}}BuiltList{{/isMap}};
-            const type = FullType(collectionType, [{{#isMap}}FullType(String), {{/isMap}}FullType({{{returnBaseType}}})]);
+            const type = FullType(Built{{#isMap}}Map{{/isMap}}{{#isArray}}{{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}{{/isArray}}, [{{#isMap}}FullType(String), {{/isMap}}FullType({{{returnBaseType}}})]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/modules/openapi-generator/src/main/resources/dart-dio/serializers.mustache
+++ b/modules/openapi-generator/src/main/resources/dart-dio/serializers.mustache
@@ -18,8 +18,8 @@ part 'serializers.g.dart';
 Serializers serializers = (_$serializers.toBuilder(){{#apiInfo}}{{#apis}}{{#serializers}}
      ..addBuilderFactory(
 {{#isArray}}
-        const FullType(BuiltList, [FullType({{baseType}})]),
-        () => ListBuilder<{{baseType}}>(),
+        const FullType(Built{{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}, [FullType({{baseType}})]),
+        () => {{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}Builder<{{baseType}}>(),
 {{/isArray}}
 {{#isMap}}
        const FullType(BuiltMap, [FullType(String), FullType({{baseType}})]),
--- a/modules/openapi-generator/src/main/resources/dart2/api.mustache
+++ b/modules/openapi-generator/src/main/resources/dart2/api.mustache
@@ -187,8 +187,8 @@ class {{{classname}}} {
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      {{#isArray}}
      return (apiClient.deserialize(_decodeBodyBytes(response), '{{{returnType}}}') as List)
-        .map((item) => item as {{{returnBaseType}}})
-        .toList(growable: false);
+        .cast<{{{returnBaseType}}}>()
+        .{{#uniqueItems}}toSet(){{/uniqueItems}}{{^uniqueItems}}toList(growable: false){{/uniqueItems}};
      {{/isArray}}
      {{^isArray}}
        {{#isMap}}
--- a/modules/openapi-generator/src/main/resources/dart2/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/dart2/api_client.mustache
@@ -194,6 +194,12 @@ class ApiClient {
              .map((v) => _deserialize(v, newTargetType, growable: growable))
              .toList(growable: true == growable);
          }
+          if (value is Set && (match = _regSet.firstMatch(targetType)) != null) {
+            final newTargetType = match[1];
+            return value
+              .map((v) => _deserialize(v, newTargetType, growable: growable))
+              .toSet();
+          }
          if (value is Map && (match = _regMap.firstMatch(targetType)) != null) {
            final newTargetType = match[1];
            return Map.fromIterables(
--- a/modules/openapi-generator/src/main/resources/dart2/apilib.mustache
+++ b/modules/openapi-generator/src/main/resources/dart2/apilib.mustache
@@ -26,6 +26,7 @@ const _delimiters = {'csv': ',', 'ssv': ' ', 'tsv': '\t', 'pipes': '|'};
 const _dateEpochMarker = 'epoch';
 final _dateFormatter = DateFormat('yyyy-MM-dd');
 final _regList = RegExp(r'^List<(.*)>$');
+final _regSet = RegExp(r'^Set<(.*)>$');
 final _regMap = RegExp(r'^Map<String,(.*)>$');

 ApiClient defaultApiClient = ApiClient();
--- a/modules/openapi-generator/src/main/resources/dart2/class.mustache
+++ b/modules/openapi-generator/src/main/resources/dart2/class.mustache
@@ -156,7 +156,7 @@ class {{{classname}}} {
        {{^isEnum}}
        {{{name}}}: json[r'{{{baseName}}}'] == null
          ? null
-          : (json[r'{{{baseName}}}'] as List).cast<{{{items.datatype}}}>(),
+          : (json[r'{{{baseName}}}'] as {{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}).cast<{{{items.datatype}}}>(),
        {{/isEnum}}
      {{/isArray}}
      {{^isArray}}
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/DartModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/DartModelTest.java
@@ -142,6 +142,45 @@ public class DartModelTest {
        Assert.assertTrue(property2.isContainer);
    }

+    @Test(description = "convert a model with set property")
+    public void setPropertyTest() {
+        final Schema model = new Schema()
+                .description("a sample model")
+                .addProperties("id", new IntegerSchema())
+                .addProperties("urls", new ArraySchema().items(new StringSchema()).uniqueItems(true))
+                .addRequiredItem("id");
+
+        final DefaultCodegen codegen = new DartClientCodegen();
+        OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", model);
+        codegen.setOpenAPI(openAPI);
+        final CodegenModel cm = codegen.fromModel("sample", model);
+
+        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 property1 = cm.vars.get(0);
+        Assert.assertEquals(property1.baseName, "id");
+        Assert.assertEquals(property1.dataType, "int");
+        Assert.assertEquals(property1.name, "id");
+        Assert.assertNull(property1.defaultValue);
+        Assert.assertEquals(property1.baseType, "int");
+        Assert.assertTrue(property1.required);
+        Assert.assertTrue(property1.isPrimitiveType);
+        Assert.assertFalse(property1.isContainer);
+
+        final CodegenProperty property2 = cm.vars.get(1);
+        Assert.assertEquals(property2.baseName, "urls");
+        Assert.assertEquals(property2.dataType, "Set<String>");
+        Assert.assertEquals(property2.name, "urls");
+        Assert.assertEquals(property2.baseType, "Set");
+        Assert.assertEquals(property2.containerType, "set");
+        Assert.assertFalse(property2.required);
+        Assert.assertTrue(property2.isPrimitiveType);
+        Assert.assertTrue(property2.isContainer);
+    }
+
    @Test(description = "convert a model with a map property")
    public void mapPropertyTest() {
        final Schema model = new Schema()
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dartdio/DartDioModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dartdio/DartDioModelTest.java
@@ -204,6 +204,44 @@ public class DartDioModelTest {
        Assert.assertTrue(property2.isContainer);
    }

+    @Test(description = "convert a model with set property")
+    public void setPropertyTest() {
+        final Schema model = new Schema()
+                .description("a sample model")
+                .addProperties("id", new IntegerSchema())
+                .addProperties("urls", new ArraySchema().items(new StringSchema()).uniqueItems(true))
+                .addRequiredItem("id");
+        final DefaultCodegen codegen = new DartDioClientCodegen();
+        OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", model);
+        codegen.setOpenAPI(openAPI);
+        final CodegenModel cm = codegen.fromModel("sample", model);
+
+        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 property1 = cm.vars.get(0);
+        Assert.assertEquals(property1.baseName, "id");
+        Assert.assertEquals(property1.dataType, "int");
+        Assert.assertEquals(property1.name, "id");
+        Assert.assertNull(property1.defaultValue);
+        Assert.assertEquals(property1.baseType, "int");
+        Assert.assertTrue(property1.required);
+        Assert.assertTrue(property1.isPrimitiveType);
+        Assert.assertFalse(property1.isContainer);
+
+        final CodegenProperty property2 = cm.vars.get(1);
+        Assert.assertEquals(property2.baseName, "urls");
+        Assert.assertEquals(property2.dataType, "BuiltSet<String>");
+        Assert.assertEquals(property2.name, "urls");
+        Assert.assertEquals(property2.baseType, "BuiltSet");
+        Assert.assertEquals(property2.containerType, "set");
+        Assert.assertFalse(property2.required);
+        Assert.assertTrue(property2.isPrimitiveType);
+        Assert.assertTrue(property2.isContainer);
+    }
+
    @Test(description = "convert a model with a map property")
    public void mapPropertyTest() {
        final Schema model = new Schema()
--- a/modules/openapi-generator/src/test/resources/3_0/petstore-with-fake-endpoints-models-for-testing.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/petstore-with-fake-endpoints-models-for-testing.yaml
@@ -134,6 +134,7 @@ paths:
            type: array
            items:
              type: string
+            uniqueItems: true
      responses:
        '200':
          description: successful operation
@@ -143,11 +144,13 @@ paths:
                type: array
                items:
                  $ref: '#/components/schemas/Pet'
+                uniqueItems: true
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Pet'
+                uniqueItems: true
        '400':
          description: Invalid tag value
      security:
@@ -1313,6 +1316,7 @@ components:
            wrapped: true
          items:
            type: string
+          uniqueItems: true
        tags:
          type: array
          xml:
--- a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Model/Pet.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Model/Pet.cs
@@ -250,6 +250,8 @@ namespace Org.OpenAPITools.Model
        /// <returns>Validation Result</returns>
        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
        {
+
+            
            yield break;
        }
    }
--- a/samples/client/petstore/dart-dio/petstore_client_lib/lib/api/pet_api.dart
+++ b/samples/client/petstore/dart-dio/petstore_client_lib/lib/api/pet_api.dart
@@ -181,8 +181,7 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltList, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
@@ -252,8 +251,7 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltList, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/samples/client/petstore/dart-dio/petstore_client_lib/lib/api/store_api.dart
+++ b/samples/client/petstore/dart-dio/petstore_client_lib/lib/api/store_api.dart
@@ -113,8 +113,7 @@ class StoreApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltMap;
-            const type = FullType(collectionType, [FullType(String), FullType(int)]);
+            const type = FullType(BuiltMap, [FullType(String), FullType(int)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/samples/client/petstore/dart2/petstore_client_lib/lib/api.dart
+++ b/samples/client/petstore/dart2/petstore_client_lib/lib/api.dart
@@ -41,6 +41,7 @@ const _delimiters = {'csv': ',', 'ssv': ' ', 'tsv': '\t', 'pipes': '|'};
 const _dateEpochMarker = 'epoch';
 final _dateFormatter = DateFormat('yyyy-MM-dd');
 final _regList = RegExp(r'^List<(.*)>$');
+final _regSet = RegExp(r'^Set<(.*)>$');
 final _regMap = RegExp(r'^Map<String,(.*)>$');

 ApiClient defaultApiClient = ApiClient();
--- a/samples/client/petstore/dart2/petstore_client_lib/lib/api/pet_api.dart
+++ b/samples/client/petstore/dart2/petstore_client_lib/lib/api/pet_api.dart
@@ -222,7 +222,7 @@ class PetApi {
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
+        .cast<Pet>()
        .toList(growable: false);
    }
    return null;
@@ -300,7 +300,7 @@ class PetApi {
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
+        .cast<Pet>()
        .toList(growable: false);
    }
    return null;
--- a/samples/client/petstore/dart2/petstore_client_lib/lib/api_client.dart
+++ b/samples/client/petstore/dart2/petstore_client_lib/lib/api_client.dart
@@ -188,6 +188,12 @@ class ApiClient {
              .map((v) => _deserialize(v, newTargetType, growable: growable))
              .toList(growable: true == growable);
          }
+          if (value is Set && (match = _regSet.firstMatch(targetType)) != null) {
+            final newTargetType = match[1];
+            return value
+              .map((v) => _deserialize(v, newTargetType, growable: growable))
+              .toSet();
+          }
          if (value is Map && (match = _regMap.firstMatch(targetType)) != null) {
            final newTargetType = match[1];
            return Map.fromIterables(
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
@@ -1055,6 +1055,7 @@ class PetApi
            );
        }

+
        $resourcePath = '/pet/findByTags';
        $formParams = [];
        $queryParams = [];
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
@@ -362,6 +362,8 @@ class Pet implements ModelInterface, ArrayAccess, \JsonSerializable
     */
    public function setPhotoUrls($photo_urls)
    {
+
+
        $this->container['photo_urls'] = $photo_urls;

        return $this;
--- a/samples/client/petstore/ruby-faraday/lib/petstore/models/pet.rb
+++ b/samples/client/petstore/ruby-faraday/lib/petstore/models/pet.rb
@@ -154,6 +154,16 @@ module Petstore
      true
    end

+    # Custom attribute writer method with validation
+    # @param [Object] photo_urls Value to be assigned
+    def photo_urls=(photo_urls)
+      if photo_urls.nil?
+        fail ArgumentError, 'photo_urls cannot be nil'
+      end
+
+      @photo_urls = photo_urls
+    end
+
    # Custom attribute writer method checking allowed values (enum).
    # @param [Object] status Object to be assigned
    def status=(status)
--- a/samples/client/petstore/ruby/lib/petstore/models/pet.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/pet.rb
@@ -154,6 +154,16 @@ module Petstore
      true
    end

+    # Custom attribute writer method with validation
+    # @param [Object] photo_urls Value to be assigned
+    def photo_urls=(photo_urls)
+      if photo_urls.nil?
+        fail ArgumentError, 'photo_urls cannot be nil'
+      end
+
+      @photo_urls = photo_urls
+    end
+
    # Custom attribute writer method checking allowed values (enum).
    # @param [Object] status Object to be assigned
    def status=(status)
--- a/samples/client/petstore/typescript-fetch/builds/default-v3.0/apis/PetApi.ts
+++ b/samples/client/petstore/typescript-fetch/builds/default-v3.0/apis/PetApi.ts
@@ -37,7 +37,7 @@ export interface FindPetsByStatusRequest {
 }

 export interface FindPetsByTagsRequest {
-    tags: Array<string>;
+    tags: Set<string>;
 }

 export interface GetPetByIdRequest {
@@ -203,7 +203,7 @@ export class PetApi extends runtime.BaseAPI {
     * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
     * Finds Pets by tags
     */
-    async findPetsByTagsRaw(requestParameters: FindPetsByTagsRequest): Promise<runtime.ApiResponse<Array<Pet>>> {
+    async findPetsByTagsRaw(requestParameters: FindPetsByTagsRequest): Promise<runtime.ApiResponse<Set<Pet>>> {
        if (requestParameters.tags === null || requestParameters.tags === undefined) {
            throw new runtime.RequiredError('tags','Required parameter requestParameters.tags was null or undefined when calling findPetsByTags.');
        }
@@ -239,7 +239,7 @@ export class PetApi extends runtime.BaseAPI {
     * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
     * Finds Pets by tags
     */
-    async findPetsByTags(requestParameters: FindPetsByTagsRequest): Promise<Array<Pet>> {
+    async findPetsByTags(requestParameters: FindPetsByTagsRequest): Promise<Set<Pet>> {
        const response = await this.findPetsByTagsRaw(requestParameters);
        return await response.value();
    }
--- a/samples/client/petstore/typescript-fetch/builds/default-v3.0/models/Pet.ts
+++ b/samples/client/petstore/typescript-fetch/builds/default-v3.0/models/Pet.ts
@@ -50,10 +50,10 @@ export interface Pet {
    name: string;
    /**
     * 
-     * @type {Array<string>}
+     * @type {Set<string>}
     * @memberof Pet
     */
-    photoUrls: Array<string>;
+    photoUrls: Set<string>;
    /**
     * 
     * @type {Array<Tag>}
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/api/pet_api.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/api/pet_api.dart
@@ -198,8 +198,7 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltList, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
@@ -269,8 +268,7 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltList, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/api/store_api.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/api/store_api.dart
@@ -113,8 +113,7 @@ class StoreApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltMap;
-            const type = FullType(collectionType, [FullType(String), FullType(int)]);
+            const type = FullType(BuiltMap, [FullType(String), FullType(int)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/doc/Pet.md
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/doc/Pet.md
@@ -11,7 +11,7 @@ Name | Type | Description | Notes
 **id** | **int** |  | [optional] 
 **category** | [**Category**](Category.md) |  | [optional] 
 **name** | **String** |  | 
-**photoUrls** | **BuiltList<String>** |  | 
+**photoUrls** | **BuiltSet<String>** |  | 
 **tags** | [**BuiltList<Tag>**](Tag.md) |  | [optional] 
 **status** | **String** | pet status in the store | [optional] 

--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/doc/PetApi.md
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/doc/PetApi.md
@@ -152,7 +152,7 @@ Name | Type | Description  | Notes
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)

 # **findPetsByTags**
-> BuiltList<Pet> findPetsByTags(tags)
+> BuiltSet<Pet> findPetsByTags(tags)

 Finds Pets by tags

@@ -165,7 +165,7 @@ import 'package:openapi/api.dart';
 //defaultApiClient.getAuthentication<OAuth>('petstore_auth').accessToken = 'YOUR_ACCESS_TOKEN';

 var api_instance = new PetApi();
-var tags = []; // BuiltList<String> | Tags to filter by
+var tags = []; // BuiltSet<String> | Tags to filter by

 try { 
    var result = api_instance.findPetsByTags(tags);
@@ -179,11 +179,11 @@ try {

 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
- **tags** | [**BuiltList<String>**](String.md)| Tags to filter by | 
+ **tags** | [**BuiltSet<String>**](String.md)| Tags to filter by | 

 ### Return type

-[**BuiltList<Pet>**](Pet.md)
+[**BuiltSet<Pet>**](Pet.md)

 ### Authorization

--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/api/pet_api.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/api/pet_api.dart
@@ -181,8 +181,7 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltList, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
@@ -206,8 +205,8 @@ class PetApi {
    /// Finds Pets by tags
    ///
    /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
-    Future<Response<BuiltList<Pet>>> findPetsByTags(
-        BuiltList<String> tags, { 
+    Future<Response<BuiltSet<Pet>>> findPetsByTags(
+        BuiltSet<String> tags, { 
        CancelToken cancelToken,
        Map<String, dynamic> headers,
        Map<String, dynamic> extra,
@@ -252,16 +251,15 @@ class PetApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltList;
-            const type = FullType(collectionType, [FullType(Pet)]);
+            const type = FullType(BuiltSet, [FullType(Pet)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
                : response.data,
                specifiedType: type,
-            ) as BuiltList<Pet>;
+            ) as BuiltSet<Pet>;

-            return Response<BuiltList<Pet>>(
+            return Response<BuiltSet<Pet>>(
                data: data,
                headers: response.headers,
                isRedirect: response.isRedirect,
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/api/store_api.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/api/store_api.dart
@@ -113,8 +113,7 @@ class StoreApi {
            onSendProgress: onSendProgress,
            onReceiveProgress: onReceiveProgress,
        ).then((response) {
-            const collectionType = BuiltMap;
-            const type = FullType(collectionType, [FullType(String), FullType(int)]);
+            const type = FullType(BuiltMap, [FullType(String), FullType(int)]);
            final data = _serializers.deserialize(
                response.data is String
                ? jsonDecode(response.data as String)
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/model/pet.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/model/pet.dart
@@ -29,7 +29,7 @@ abstract class Pet implements Built<Pet, PetBuilder> {

    @nullable
    @BuiltValueField(wireName: r'photoUrls')
-    BuiltList<String> get photoUrls;
+    BuiltSet<String> get photoUrls;

    @nullable
    @BuiltValueField(wireName: r'tags')
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/serializers.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/serializers.dart
@@ -109,6 +109,10 @@ Serializers serializers = (_$serializers.toBuilder()
        const FullType(BuiltMap, [FullType(String), FullType(String)]),
        () => MapBuilder<String, String>(),
      )
+      ..addBuilderFactory(
+        const FullType(BuiltSet, [FullType(Pet)]),
+        () => SetBuilder<Pet>(),
+      )
      ..addBuilderFactory(
        const FullType(BuiltList, [FullType(Pet)]),
        () => ListBuilder<Pet>(),
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/test/pet_api_test.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/test/pet_api_test.dart
@@ -35,7 +35,7 @@ void main() {
    //
    // Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
    //
-    //Future<BuiltList<Pet>> findPetsByTags(BuiltList<String> tags) async
+    //Future<BuiltSet<Pet>> findPetsByTags(BuiltSet<String> tags) async
    test('test findPetsByTags', () async {
      // TODO
    });
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/test/pet_test.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/test/pet_test.dart
@@ -21,7 +21,7 @@ void main() {
      // TODO
    });

-    // BuiltList<String> photoUrls
+    // BuiltSet<String> photoUrls
    test('to test the property `photoUrls`', () async {
      // TODO
    });
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api.dart
@@ -41,6 +41,7 @@ const _delimiters = {'csv': ',', 'ssv': ' ', 'tsv': '\t', 'pipes': '|'};
 const _dateEpochMarker = 'epoch';
 final _dateFormatter = DateFormat('yyyy-MM-dd');
 final _regList = RegExp(r'^List<(.*)>$');
+final _regSet = RegExp(r'^Set<(.*)>$');
 final _regMap = RegExp(r'^Map<String,(.*)>$');

 ApiClient defaultApiClient = ApiClient();
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api/pet_api.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api/pet_api.dart
@@ -229,7 +229,7 @@ class PetApi {
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
+        .cast<Pet>()
        .toList(growable: false);
    }
    return null;
@@ -307,7 +307,7 @@ class PetApi {
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
+        .cast<Pet>()
        .toList(growable: false);
    }
    return null;
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api_client.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib/lib/api_client.dart
@@ -188,6 +188,12 @@ class ApiClient {
              .map((v) => _deserialize(v, newTargetType, growable: growable))
              .toList(growable: true == growable);
          }
+          if (value is Set && (match = _regSet.firstMatch(targetType)) != null) {
+            final newTargetType = match[1];
+            return value
+              .map((v) => _deserialize(v, newTargetType, growable: growable))
+              .toSet();
+          }
          if (value is Map && (match = _regMap.firstMatch(targetType)) != null) {
            final newTargetType = match[1];
            return Map.fromIterables(
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/doc/Pet.md
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/doc/Pet.md
@@ -11,7 +11,7 @@ Name | Type | Description | Notes
 **id** | **int** |  | [optional] 
 **category** | [**Category**](Category.md) |  | [optional] 
 **name** | **String** |  | 
-**photoUrls** | **List<String>** |  | [default to const []]
+**photoUrls** | **Set<String>** |  | [default to const {}]
 **tags** | [**List<Tag>**](Tag.md) |  | [optional] [default to const []]
 **status** | **String** | pet status in the store | [optional] 

--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/doc/PetApi.md
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/doc/PetApi.md
@@ -152,7 +152,7 @@ Name | Type | Description  | Notes
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)

 # **findPetsByTags**
-> List<Pet> findPetsByTags(tags)
+> Set<Pet> findPetsByTags(tags)

 Finds Pets by tags

@@ -165,7 +165,7 @@ import 'package:openapi/api.dart';
 //defaultApiClient.getAuthentication<OAuth>('petstore_auth').accessToken = 'YOUR_ACCESS_TOKEN';

 final api_instance = PetApi();
-final tags = []; // List<String> | Tags to filter by
+final tags = []; // Set<String> | Tags to filter by

 try { 
    final result = api_instance.findPetsByTags(tags);
@@ -179,11 +179,11 @@ try {

 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
- **tags** | [**List<String>**](String.md)| Tags to filter by | [default to const []]
+ **tags** | [**Set<String>**](String.md)| Tags to filter by | [default to const {}]

 ### Return type

-[**List<Pet>**](Pet.md)
+[**Set<Pet>**](Pet.md)

 ### Authorization

--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api.dart
@@ -82,6 +82,7 @@ const _delimiters = {'csv': ',', 'ssv': ' ', 'tsv': '\t', 'pipes': '|'};
 const _dateEpochMarker = 'epoch';
 final _dateFormatter = DateFormat('yyyy-MM-dd');
 final _regList = RegExp(r'^List<(.*)>$');
+final _regSet = RegExp(r'^Set<(.*)>$');
 final _regMap = RegExp(r'^Map<String,(.*)>$');

 ApiClient defaultApiClient = ApiClient();
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api/pet_api.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api/pet_api.dart
@@ -222,7 +222,7 @@ class PetApi {
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
+        .cast<Pet>()
        .toList(growable: false);
    }
    return null;
@@ -236,9 +236,9 @@ class PetApi {
  ///
  /// Parameters:
  ///
-  /// * [List<String>] tags (required):
+  /// * [Set<String>] tags (required):
  ///   Tags to filter by
-  Future<Response> findPetsByTagsWithHttpInfo(List<String> tags) async {
+  Future<Response> findPetsByTagsWithHttpInfo(Set<String> tags) async {
    // Verify required params are set.
    if (tags == null) {
     throw ApiException(HttpStatus.badRequest, 'Missing required param: tags');
@@ -288,9 +288,9 @@ class PetApi {
  ///
  /// Parameters:
  ///
-  /// * [List<String>] tags (required):
+  /// * [Set<String>] tags (required):
  ///   Tags to filter by
-  Future<List<Pet>> findPetsByTags(List<String> tags) async {
+  Future<Set<Pet>> findPetsByTags(Set<String> tags) async {
    final response = await findPetsByTagsWithHttpInfo(tags);
    if (response.statusCode >= HttpStatus.badRequest) {
      throw ApiException(response.statusCode, _decodeBodyBytes(response));
@@ -299,9 +299,9 @@ class PetApi {
    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
    // FormatException when trying to decode an empty string.
    if (response.body != null && response.statusCode != HttpStatus.noContent) {
-      return (apiClient.deserialize(_decodeBodyBytes(response), 'List<Pet>') as List)
-        .map((item) => item as Pet)
-        .toList(growable: false);
+      return (apiClient.deserialize(_decodeBodyBytes(response), 'Set<Pet>') as List)
+        .cast<Pet>()
+        .toSet();
    }
    return null;
  }
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api_client.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/api_client.dart
@@ -265,6 +265,12 @@ class ApiClient {
              .map((v) => _deserialize(v, newTargetType, growable: growable))
              .toList(growable: true == growable);
          }
+          if (value is Set && (match = _regSet.firstMatch(targetType)) != null) {
+            final newTargetType = match[1];
+            return value
+              .map((v) => _deserialize(v, newTargetType, growable: growable))
+              .toSet();
+          }
          if (value is Map && (match = _regMap.firstMatch(targetType)) != null) {
            final newTargetType = match[1];
            return Map.fromIterables(
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/model/pet.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/lib/model/pet.dart
@@ -15,7 +15,7 @@ class Pet {
    this.id,
    this.category,
    @required this.name,
-    this.photoUrls = const [],
+    this.photoUrls = const {},
    this.tags = const [],
    this.status,
  });
@@ -26,7 +26,7 @@ class Pet {

  String name;

-  List<String> photoUrls;
+  Set<String> photoUrls;

  List<Tag> tags;

@@ -87,7 +87,7 @@ class Pet {
        name: json[r'name'],
        photoUrls: json[r'photoUrls'] == null
          ? null
-          : (json[r'photoUrls'] as List).cast<String>(),
+          : (json[r'photoUrls'] as Set).cast<String>(),
        tags: Tag.listFromJson(json[r'tags']),
        status: PetStatusEnum.fromJson(json[r'status']),
    );
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/test/pet_api_test.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/test/pet_api_test.dart
@@ -43,7 +43,7 @@ void main() {
    //
    // Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
    //
-    //Future<List<Pet>> findPetsByTags(List<String> tags) async
+    //Future<Set<Pet>> findPetsByTags(Set<String> tags) async
    test('test findPetsByTags', () async {
      // TODO
    });
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/test/pet_test.dart
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/test/pet_test.dart
@@ -21,7 +21,7 @@ void main() {
      // TODO
    });

-    // List<String> photoUrls (default value: const [])
+    // Set<String> photoUrls (default value: const {})
    test('to test the property `photoUrls`', () async {
      // TODO
    });
--- a/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/api/PetApi.java
+++ b/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/api/PetApi.java
@@ -10,6 +10,7 @@ import io.swagger.jaxrs.*;
 import java.io.File;
 import org.openapitools.model.ModelApiResponse;
 import org.openapitools.model.Pet;
+import java.util.Set;

 import java.util.Map;
 import java.util.List;
@@ -115,17 +116,17 @@ public class PetApi  {
    @Path("/findByTags")
    
    @Produces({ "application/xml", "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "Finds Pets by tags", notes = "Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.", response = Pet.class, responseContainer = "List", authorizations = {
+    @io.swagger.annotations.ApiOperation(value = "Finds Pets by tags", notes = "Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.", response = Pet.class, responseContainer = "Set", authorizations = {
        @io.swagger.annotations.Authorization(value = "petstore_auth", scopes = {
            @io.swagger.annotations.AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
            @io.swagger.annotations.AuthorizationScope(scope = "read:pets", description = "read your pets")
        })
    }, tags={ "pet", })
    @io.swagger.annotations.ApiResponses(value = {
-        @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Pet.class, responseContainer = "List"),
+        @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Pet.class, responseContainer = "Set"),
        @io.swagger.annotations.ApiResponse(code = 400, message = "Invalid tag value", response = Void.class)
    })
-    public Response findPetsByTags(@ApiParam(value = "Tags to filter by", required = true) @QueryParam("tags") @NotNull @Valid  List<String> tags,@Context SecurityContext securityContext)
+    public Response findPetsByTags(@ApiParam(value = "Tags to filter by", required = true) @QueryParam("tags") @NotNull @Valid  Set<String> tags,@Context SecurityContext securityContext)
    throws NotFoundException {
        return delegate.findPetsByTags(tags, securityContext);
    }
--- a/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/api/PetApiService.java
+++ b/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/api/PetApiService.java
@@ -8,6 +8,7 @@ import org.glassfish.jersey.media.multipart.FormDataBodyPart;
 import java.io.File;
 import org.openapitools.model.ModelApiResponse;
 import org.openapitools.model.Pet;
+import java.util.Set;

 import java.util.List;
 import org.openapitools.api.NotFoundException;
@@ -22,7 +23,7 @@ public abstract class PetApiService {
    public abstract Response addPet(Pet pet,SecurityContext securityContext) throws NotFoundException;
    public abstract Response deletePet(Long petId,String apiKey,SecurityContext securityContext) throws NotFoundException;
    public abstract Response findPetsByStatus( @NotNull List<String> status,SecurityContext securityContext) throws NotFoundException;
-    public abstract Response findPetsByTags( @NotNull List<String> tags,SecurityContext securityContext) throws NotFoundException;
+    public abstract Response findPetsByTags( @NotNull Set<String> tags,SecurityContext securityContext) throws NotFoundException;
    public abstract Response getPetById(Long petId,SecurityContext securityContext) throws NotFoundException;
    public abstract Response updatePet(Pet pet,SecurityContext securityContext) throws NotFoundException;
    public abstract Response updatePetWithForm(Long petId,String name,String status,SecurityContext securityContext) throws NotFoundException;
--- a/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/model/Pet.java
@@ -20,7 +20,9 @@ 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.model.Category;
 import org.openapitools.model.Tag;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -54,7 +56,7 @@ public class Pet   {

  public static final String JSON_PROPERTY_PHOTO_URLS = "photoUrls";
  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
-  private List<String> photoUrls = new ArrayList<String>();
+  private Set<String> photoUrls = new LinkedHashSet<String>();

  public static final String JSON_PROPERTY_TAGS = "tags";
  @JsonProperty(JSON_PROPERTY_TAGS)
@@ -157,7 +159,7 @@ public class Pet   {
    this.name = name;
  }

-  public Pet photoUrls(List<String> photoUrls) {
+  public Pet photoUrls(Set<String> photoUrls) {
    this.photoUrls = photoUrls;
    return this;
  }
@@ -174,11 +176,11 @@ public class Pet   {
  @JsonProperty("photoUrls")
  @ApiModelProperty(required = true, value = "")
  @NotNull 
-  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;
  }

--- a/samples/server/petstore/jaxrs-jersey/src/main/java/org/openapitools/api/impl/PetApiServiceImpl.java
+++ b/samples/server/petstore/jaxrs-jersey/src/main/java/org/openapitools/api/impl/PetApiServiceImpl.java
@@ -6,6 +6,7 @@ import org.openapitools.model.*;
 import java.io.File;
 import org.openapitools.model.ModelApiResponse;
 import org.openapitools.model.Pet;
+import java.util.Set;

 import java.util.List;
 import org.openapitools.api.NotFoundException;
@@ -35,7 +36,7 @@ public class PetApiServiceImpl extends PetApiService {
        return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();
    }
    @Override
-    public Response findPetsByTags( @NotNull List<String> tags, SecurityContext securityContext) throws NotFoundException {
+    public Response findPetsByTags( @NotNull Set<String> tags, SecurityContext securityContext) throws NotFoundException {
        // do some magic!
        return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();
    }