diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
index 68fd77a768b..dbe0af28fb2 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
@@ -1087,7 +1087,12 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
     public void setParameterExampleValue(CodegenParameter p) {
         String example;
 
-        if (p.defaultValue == null) {
+        boolean hasAllowableValues = p.allowableValues != null && !p.allowableValues.isEmpty();
+        if (hasAllowableValues) {
+            //support examples for inline enums
+            final List<Object> values = (List<Object>) p.allowableValues.get("values");
+            example = String.valueOf(values.get(0));
+        } else if (p.defaultValue == null) {
             example = p.example;
         } else {
             example = p.defaultValue;
@@ -1133,14 +1138,33 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             example = "new File(\"" + escapeText(example) + "\")";
         } else if ("Date".equals(type)) {
             example = "new Date()";
+        } else if ("LocalDate".equals(type)) {
+            if (example == null) {
+                example = "LocalDate.now()";
+            } else {
+                example = "LocalDate.parse(\"" + example + "\")";
+            }
         } else if ("OffsetDateTime".equals(type)) {
-            example = "OffsetDateTime.now()";
+            if (example == null) {
+                example = "OffsetDateTime.now()";
+            } else {
+                example = "OffsetDateTime.parse(\"" + example + "\")";
+            }
         } else if ("BigDecimal".equals(type)) {
-            example = "new BigDecimal(78)";
-        } else if (p.allowableValues != null && !p.allowableValues.isEmpty()) {
-            Map<String, Object> allowableValues = p.allowableValues;
-            List<Object> values = (List<Object>) allowableValues.get("values");
-            example = type + ".fromValue(\"" + String.valueOf(values.get(0)) + "\")";
+            if (example == null) {
+                example = "new BigDecimal(78)";
+            } else {
+                example = "new BigDecimal(\"" + example + "\")";
+            }
+        } else if ("UUID".equals(type)) {
+            if (example == null) {
+                example = "UUID.randomUUID()";
+            } else {
+                example = "UUID.fromString(\"" + example + "\")";
+            }
+        } else if (hasAllowableValues) {
+            //parameter is enum defined as a schema component
+            example = type + ".fromValue(\"" + example + "\")";
         } else if (!languageSpecificPrimitives.contains(type)) {
             // type is a model class, e.g. User
             example = "new " + type + "()";
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenExampleValuesTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenExampleValuesTest.java
new file mode 100644
index 00000000000..d9f451a462e
--- /dev/null
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenExampleValuesTest.java
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ * Copyright 2018 SmartBear Software
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openapitools.codegen.java;
+
+import org.openapitools.codegen.CodegenParameter;
+import org.openapitools.codegen.CodegenProperty;
+import org.openapitools.codegen.CodegenType;
+import org.openapitools.codegen.languages.AbstractJavaCodegen;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+public class AbstractJavaCodegenExampleValuesTest {
+
+    private final AbstractJavaCodegen fakeJavaCodegen = new P_AbstractJavaCodegen();
+
+    @Test
+    void referencedEnumTakeFirstName() {
+        final CodegenParameter p = new CodegenParameter();
+        p.allowableValues = Collections.singletonMap("values", Arrays.asList("first", "second"));
+        p.dataType = "WrappedEnum";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "WrappedEnum.fromValue(\"first\")");
+    }
+
+    @Test
+    void inlineEnum() {
+        final CodegenParameter p = new CodegenParameter();
+        p.allowableValues = Collections.singletonMap("values", Arrays.asList("first", "second"));
+        p.isEnum = true;
+        p.dataType = "String";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "\"first\"");
+    }
+
+    @Test
+    void inlineEnumArray() {
+        final CodegenParameter p = new CodegenParameter();
+        p.allowableValues = Collections.singletonMap("values", Arrays.asList("first", "second"));
+        p.isEnum = true;
+        p.isArray = true;
+        p.dataType = "List<String>";
+        p.items = new CodegenProperty();
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "Arrays.asList()");
+    }
+
+    @Test
+    void dateDefault() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isDate = true;
+        p.dataType = "LocalDate";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "LocalDate.now()");
+    }
+
+    @Test
+    void dateGivenExample() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isDate = true;
+        p.dataType = "LocalDate";
+        p.example = "2017-03-30";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "LocalDate.parse(\"2017-03-30\")");
+    }
+
+    @Test
+    void dateTimeDefault() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isDateTime = true;
+        p.dataType = "OffsetDateTime";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "OffsetDateTime.now()");
+    }
+
+    @Test
+    void dateTimeGivenExample() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isDateTime = true;
+        p.dataType = "OffsetDateTime";
+        p.example = "2007-12-03T10:15:30+01:00";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "OffsetDateTime.parse(\"2007-12-03T10:15:30+01:00\")");
+    }
+
+    @Test
+    void uuidDefault() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isUuid = true;
+        p.dataType = "UUID";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "UUID.randomUUID()");
+    }
+
+    @Test
+    void uuidGivenExample() {
+        final CodegenParameter p = new CodegenParameter();
+        p.isUuid = true;
+        p.dataType = "UUID";
+        p.example = "13b48713-b931-45ea-bd60-b07491245960";
+
+        fakeJavaCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "UUID.fromString(\"13b48713-b931-45ea-bd60-b07491245960\")");
+    }
+
+    private static class P_AbstractJavaCodegen extends AbstractJavaCodegen {
+        @Override
+        public CodegenType getTag() {
+            return null;
+        }
+
+        @Override
+        public String getName() {
+            return null;
+        }
+
+        @Override
+        public String getHelp() {
+            return null;
+        }
+
+        /**
+         * Gets artifact version.
+         * Only for testing purposes.
+         *
+         * @return version
+         */
+        public String getArtifactVersion() {
+            return this.artifactVersion;
+        }
+    }
+}
diff --git a/samples/client/petstore/java/apache-httpclient/docs/FakeApi.md b/samples/client/petstore/java/apache-httpclient/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/apache-httpclient/docs/FakeApi.md
+++ b/samples/client/petstore/java/apache-httpclient/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/google-api-client/docs/FakeApi.md b/samples/client/petstore/java/google-api-client/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/google-api-client/docs/FakeApi.md
+++ b/samples/client/petstore/java/google-api-client/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/jersey1/docs/FakeApi.md b/samples/client/petstore/java/jersey1/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/jersey1/docs/FakeApi.md
+++ b/samples/client/petstore/java/jersey1/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/docs/FakeApi.md b/samples/client/petstore/java/jersey2-java8-localdatetime/docs/FakeApi.md
index 9b87b7538f6..c538fd7fcd4 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/docs/FakeApi.md
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         LocalDateTime dateTime = new LocalDateTime(); // LocalDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -668,13 +668,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/jersey2-java8/docs/FakeApi.md b/samples/client/petstore/java/jersey2-java8/docs/FakeApi.md
index a5c59d91e0b..29f79920394 100644
--- a/samples/client/petstore/java/jersey2-java8/docs/FakeApi.md
+++ b/samples/client/petstore/java/jersey2-java8/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -668,13 +668,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/native-async/docs/FakeApi.md b/samples/client/petstore/java/native-async/docs/FakeApi.md
index 40a35f715d8..fd327749d6c 100644
--- a/samples/client/petstore/java/native-async/docs/FakeApi.md
+++ b/samples/client/petstore/java/native-async/docs/FakeApi.md
@@ -1214,7 +1214,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -1313,7 +1313,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -1406,13 +1406,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             CompletableFuture<Void> result = apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
@@ -1487,13 +1487,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             CompletableFuture<ApiResponse<Void>> response = apiInstance.testEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
             System.out.println("Status code: " + response.get().getStatusCode());
diff --git a/samples/client/petstore/java/native/docs/FakeApi.md b/samples/client/petstore/java/native/docs/FakeApi.md
index 64ac73b2bbc..1d0e8ca9ebb 100644
--- a/samples/client/petstore/java/native/docs/FakeApi.md
+++ b/samples/client/petstore/java/native/docs/FakeApi.md
@@ -1141,7 +1141,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -1239,7 +1239,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -1324,13 +1324,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
@@ -1404,13 +1404,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             ApiResponse<Void> response = apiInstance.testEnumParametersWithHttpInfo(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
             System.out.println("Status code: " + response.getStatusCode());
diff --git a/samples/client/petstore/java/okhttp-gson-dynamicOperations/docs/FakeApi.md b/samples/client/petstore/java/okhttp-gson-dynamicOperations/docs/FakeApi.md
index 6a47638bab7..5a20b8b1911 100644
--- a/samples/client/petstore/java/okhttp-gson-dynamicOperations/docs/FakeApi.md
+++ b/samples/client/petstore/java/okhttp-gson-dynamicOperations/docs/FakeApi.md
@@ -552,7 +552,7 @@ public class Example {
     Float _float = 3.4F; // Float | None
     String string = "string_example"; // String | None
     File binary = new File("/path/to/file"); // File | None
-    LocalDate date = new LocalDate(); // LocalDate | None
+    LocalDate date = LocalDate.now(); // LocalDate | None
     OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
     String password = "password_example"; // String | None
     String paramCallback = "paramCallback_example"; // String | None
@@ -631,13 +631,13 @@ public class Example {
 
     FakeApi apiInstance = new FakeApi(defaultClient);
     List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-    String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+    String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
     List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-    String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-    Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-    Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-    List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-    String enumFormString = "-efg"; // String | Form parameter enum test (string)
+    String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+    Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+    Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+    List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+    String enumFormString = "_abc"; // String | Form parameter enum test (string)
     try {
       apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
     } catch (ApiException e) {
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/docs/FakeApi.md b/samples/client/petstore/java/okhttp-gson-parcelableModel/docs/FakeApi.md
index 6a47638bab7..5a20b8b1911 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/docs/FakeApi.md
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/docs/FakeApi.md
@@ -552,7 +552,7 @@ public class Example {
     Float _float = 3.4F; // Float | None
     String string = "string_example"; // String | None
     File binary = new File("/path/to/file"); // File | None
-    LocalDate date = new LocalDate(); // LocalDate | None
+    LocalDate date = LocalDate.now(); // LocalDate | None
     OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
     String password = "password_example"; // String | None
     String paramCallback = "paramCallback_example"; // String | None
@@ -631,13 +631,13 @@ public class Example {
 
     FakeApi apiInstance = new FakeApi(defaultClient);
     List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-    String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+    String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
     List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-    String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-    Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-    Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-    List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-    String enumFormString = "-efg"; // String | Form parameter enum test (string)
+    String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+    Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+    Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+    List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+    String enumFormString = "_abc"; // String | Form parameter enum test (string)
     try {
       apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
     } catch (ApiException e) {
diff --git a/samples/client/petstore/java/okhttp-gson/docs/FakeApi.md b/samples/client/petstore/java/okhttp-gson/docs/FakeApi.md
index 6a47638bab7..5a20b8b1911 100644
--- a/samples/client/petstore/java/okhttp-gson/docs/FakeApi.md
+++ b/samples/client/petstore/java/okhttp-gson/docs/FakeApi.md
@@ -552,7 +552,7 @@ public class Example {
     Float _float = 3.4F; // Float | None
     String string = "string_example"; // String | None
     File binary = new File("/path/to/file"); // File | None
-    LocalDate date = new LocalDate(); // LocalDate | None
+    LocalDate date = LocalDate.now(); // LocalDate | None
     OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
     String password = "password_example"; // String | None
     String paramCallback = "paramCallback_example"; // String | None
@@ -631,13 +631,13 @@ public class Example {
 
     FakeApi apiInstance = new FakeApi(defaultClient);
     List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-    String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+    String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
     List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-    String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-    Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-    Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-    List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-    String enumFormString = "-efg"; // String | Form parameter enum test (string)
+    String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+    Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+    Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+    List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+    String enumFormString = "_abc"; // String | Form parameter enum test (string)
     try {
       apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
     } catch (ApiException e) {
diff --git a/samples/client/petstore/java/resteasy/docs/FakeApi.md b/samples/client/petstore/java/resteasy/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/resteasy/docs/FakeApi.md
+++ b/samples/client/petstore/java/resteasy/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md b/samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md
+++ b/samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/resttemplate/docs/FakeApi.md b/samples/client/petstore/java/resttemplate/docs/FakeApi.md
index 4f81e527a10..c76fd80c324 100644
--- a/samples/client/petstore/java/resttemplate/docs/FakeApi.md
+++ b/samples/client/petstore/java/resttemplate/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/retrofit2-play26/docs/FakeApi.md b/samples/client/petstore/java/retrofit2-play26/docs/FakeApi.md
index 740c810f28b..d0080643e4b 100644
--- a/samples/client/petstore/java/retrofit2-play26/docs/FakeApi.md
+++ b/samples/client/petstore/java/retrofit2-play26/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/retrofit2/docs/FakeApi.md b/samples/client/petstore/java/retrofit2/docs/FakeApi.md
index 740c810f28b..d0080643e4b 100644
--- a/samples/client/petstore/java/retrofit2/docs/FakeApi.md
+++ b/samples/client/petstore/java/retrofit2/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/retrofit2rx2/docs/FakeApi.md b/samples/client/petstore/java/retrofit2rx2/docs/FakeApi.md
index 740c810f28b..d0080643e4b 100644
--- a/samples/client/petstore/java/retrofit2rx2/docs/FakeApi.md
+++ b/samples/client/petstore/java/retrofit2rx2/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/retrofit2rx3/docs/FakeApi.md b/samples/client/petstore/java/retrofit2rx3/docs/FakeApi.md
index 740c810f28b..d0080643e4b 100644
--- a/samples/client/petstore/java/retrofit2rx3/docs/FakeApi.md
+++ b/samples/client/petstore/java/retrofit2rx3/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/vertx-no-nullable/docs/FakeApi.md b/samples/client/petstore/java/vertx-no-nullable/docs/FakeApi.md
index c50095a6a58..99c87b67656 100644
--- a/samples/client/petstore/java/vertx-no-nullable/docs/FakeApi.md
+++ b/samples/client/petstore/java/vertx-no-nullable/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         AsyncFile binary = new AsyncFile(); // AsyncFile | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/vertx/docs/FakeApi.md b/samples/client/petstore/java/vertx/docs/FakeApi.md
index c50095a6a58..99c87b67656 100644
--- a/samples/client/petstore/java/vertx/docs/FakeApi.md
+++ b/samples/client/petstore/java/vertx/docs/FakeApi.md
@@ -586,7 +586,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         AsyncFile binary = new AsyncFile(); // AsyncFile | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -669,13 +669,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/client/petstore/java/webclient/docs/FakeApi.md b/samples/client/petstore/java/webclient/docs/FakeApi.md
index 8630d8419c8..b4c92eb6a9c 100644
--- a/samples/client/petstore/java/webclient/docs/FakeApi.md
+++ b/samples/client/petstore/java/webclient/docs/FakeApi.md
@@ -784,7 +784,7 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
         OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
@@ -867,13 +867,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/docs/FakeApi.md b/samples/openapi3/client/petstore/java/jersey2-java8/docs/FakeApi.md
index 505db20273f..32a66fa54dc 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/docs/FakeApi.md
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/docs/FakeApi.md
@@ -642,8 +642,8 @@ public class Example {
         Float _float = 3.4F; // Float | None
         String string = "string_example"; // String | None
         File binary = new File("/path/to/file"); // File | None
-        LocalDate date = new LocalDate(); // LocalDate | None
-        OffsetDateTime dateTime = OffsetDateTime.now(); // OffsetDateTime | None
+        LocalDate date = LocalDate.now(); // LocalDate | None
+        OffsetDateTime dateTime = OffsetDateTime.parse("OffsetDateTime.parse("2010-02-01T09:20:10.111110Z[UTC]", java.time.format.DateTimeFormatter.ISO_ZONED_DATE_TIME.withZone(java.time.ZoneId.systemDefault()))"); // OffsetDateTime | None
         String password = "password_example"; // String | None
         String paramCallback = "paramCallback_example"; // String | None
         try {
@@ -724,13 +724,13 @@ public class Example {
 
         FakeApi apiInstance = new FakeApi(defaultClient);
         List<String> enumHeaderStringArray = Arrays.asList("$"); // List<String> | Header parameter enum test (string array)
-        String enumHeaderString = "-efg"; // String | Header parameter enum test (string)
+        String enumHeaderString = "_abc"; // String | Header parameter enum test (string)
         List<String> enumQueryStringArray = Arrays.asList("$"); // List<String> | Query parameter enum test (string array)
-        String enumQueryString = "-efg"; // String | Query parameter enum test (string)
-        Integer enumQueryInteger = 56; // Integer | Query parameter enum test (double)
-        Double enumQueryDouble = 3.4D; // Double | Query parameter enum test (double)
-        List<String> enumFormStringArray = "$"; // List<String> | Form parameter enum test (string array)
-        String enumFormString = "-efg"; // String | Form parameter enum test (string)
+        String enumQueryString = "_abc"; // String | Query parameter enum test (string)
+        Integer enumQueryInteger = 1; // Integer | Query parameter enum test (double)
+        Double enumQueryDouble = 1.1D; // Double | Query parameter enum test (double)
+        List<String> enumFormStringArray = ">"; // List<String> | Form parameter enum test (string array)
+        String enumFormString = "_abc"; // String | Form parameter enum test (string)
         try {
             apiInstance.testEnumParameters(enumHeaderStringArray, enumHeaderString, enumQueryStringArray, enumQueryString, enumQueryInteger, enumQueryDouble, enumFormStringArray, enumFormString);
         } catch (ApiException e) {