diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/bodyParams.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/bodyParams.mustache
index 16ac260f9d9..c2a1faa8c9f 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/bodyParams.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/bodyParams.mustache
@@ -1 +1 @@
-{{#isBodyParam}}@ApiParam(value = "{{{description}}}" {{#required}},required=true{{/required}} {{^isContainer}}{{#allowableValues}}, allowableValues="{{{allowableValues}}}"{{/allowableValues}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}})  {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestBody {{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}} {{paramName}}{{/isBodyParam}}
\ No newline at end of file
+{{#isBodyParam}}@ApiParam(value = "{{{description}}}" {{#required}},required=true{{/required}} {{^isContainer}}{{#allowableValues}}, allowableValues="{{{allowableValues}}}"{{/allowableValues}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}})  {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestBody{{^required}}(required = false){{/required}} {{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}} {{paramName}}{{/isBodyParam}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
index 1febdfe86ee..dda7c67d3eb 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
@@ -416,4 +416,28 @@ public class SpringCodegenTest {
         codegen.additionalProperties().put(CodegenConstants.LIBRARY, "spring-cloud");
         codegen.processOpts();
     }
+
+    @Test
+    public void testDoGenerateRequestBodyRequiredAttribute_3134_Regression() throws Exception {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/3_0/3134-regression.yaml", null, new ParseOptions()).getOpenAPI();
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+
+        ClientOptInput input = new ClientOptInput();
+        input.setOpenAPI(openAPI);
+        input.setConfig(codegen);
+
+        MockDefaultGenerator generator = new MockDefaultGenerator();
+        generator.opts(input).generate();
+
+        checkFileContains(generator, outputPath + "/src/main/java/org/openapitools/api/ExampleApi.java",
+                "@RequestBody(required = false");
+    }
 }
diff --git a/modules/openapi-generator/src/test/resources/3_0/3134-regression.yaml b/modules/openapi-generator/src/test/resources/3_0/3134-regression.yaml
new file mode 100644
index 00000000000..a9fc8fb4532
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/3134-regression.yaml
@@ -0,0 +1,23 @@
+openapi: 3.0.2
+info:
+  title: info
+  description: info
+  version: 0.1.0
+
+paths:
+  /example/api:
+    post:
+      summary: summary
+      description: description
+      requestBody:
+        required: false
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                name:
+                  type: string
+      responses:
+        200:
+          description: response
\ No newline at end of file
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/api/FakeApi.java
index d3af74a0a22..fde21a6ef04 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/api/FakeApi.java
@@ -78,7 +78,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default CompletableFuture<ResponseEntity<Boolean>> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default CompletableFuture<ResponseEntity<Boolean>> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return CompletableFuture.completedFuture(new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED));
 
     }
@@ -97,7 +97,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default CompletableFuture<ResponseEntity<OuterComposite>> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default CompletableFuture<ResponseEntity<OuterComposite>> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         return CompletableFuture.supplyAsync(()-> {
             getRequest().ifPresent(request -> {
                 for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
@@ -127,7 +127,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default CompletableFuture<ResponseEntity<BigDecimal>> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default CompletableFuture<ResponseEntity<BigDecimal>> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return CompletableFuture.completedFuture(new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED));
 
     }
@@ -146,7 +146,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default CompletableFuture<ResponseEntity<String>> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default CompletableFuture<ResponseEntity<String>> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return CompletableFuture.completedFuture(new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED));
 
     }
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/api/FakeApi.java
index 8f25bcb0ede..fcac0605ab6 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/api/FakeApi.java
@@ -77,7 +77,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -96,7 +96,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
@@ -124,7 +124,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -143,7 +143,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApi.java
index b8788d88f31..8734c49ea19 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApi.java
@@ -66,7 +66,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body);
+    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body);
 
 
     /**
@@ -82,7 +82,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body);
+    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body);
 
 
     /**
@@ -98,7 +98,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body);
+    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body);
 
 
     /**
@@ -114,7 +114,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body);
+    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body);
 
 
     /**
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApiController.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApiController.java
index aac6a3e3b1d..7b194d00458 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApiController.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/FakeApiController.java
@@ -62,7 +62,7 @@ public class FakeApiController implements FakeApi {
      * @return Output boolean (status code 200)
      * @see FakeApi#fakeOuterBooleanSerialize
      */
-    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -75,7 +75,7 @@ public class FakeApiController implements FakeApi {
      * @return Output composite (status code 200)
      * @see FakeApi#fakeOuterCompositeSerialize
      */
-    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
                 String exampleString = "{ \"my_string\" : \"my_string\", \"my_number\" : 0.8008281904610115, \"my_boolean\" : true }";
@@ -95,7 +95,7 @@ public class FakeApiController implements FakeApi {
      * @return Output number (status code 200)
      * @see FakeApi#fakeOuterNumberSerialize
      */
-    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -108,7 +108,7 @@ public class FakeApiController implements FakeApi {
      * @return Output string (status code 200)
      * @see FakeApi#fakeOuterStringSerialize
      */
-    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApi.java
index b8788d88f31..8734c49ea19 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApi.java
@@ -66,7 +66,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body);
+    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body);
 
 
     /**
@@ -82,7 +82,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body);
+    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body);
 
 
     /**
@@ -98,7 +98,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body);
+    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body);
 
 
     /**
@@ -114,7 +114,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body);
+    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body);
 
 
     /**
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApiController.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApiController.java
index 828761ab32e..05c54707b03 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApiController.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/api/FakeApiController.java
@@ -62,7 +62,7 @@ public class FakeApiController implements FakeApi {
      * @return Output boolean (status code 200)
      * @see FakeApi#fakeOuterBooleanSerialize
      */
-    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -75,7 +75,7 @@ public class FakeApiController implements FakeApi {
      * @return Output composite (status code 200)
      * @see FakeApi#fakeOuterCompositeSerialize
      */
-    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
                 String exampleString = "{ \"my_string\" : \"my_string\", \"my_number\" : 0.8008281904610115, \"my_boolean\" : true }";
@@ -95,7 +95,7 @@ public class FakeApiController implements FakeApi {
      * @return Output number (status code 200)
      * @see FakeApi#fakeOuterNumberSerialize
      */
-    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -108,7 +108,7 @@ public class FakeApiController implements FakeApi {
      * @return Output string (status code 200)
      * @see FakeApi#fakeOuterStringSerialize
      */
-    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/api/FakeApi.java
index 8042e0c8cbc..e90acd63c13 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/api/FakeApi.java
@@ -72,7 +72,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return getDelegate().fakeOuterBooleanSerialize(body);
     }
 
@@ -90,7 +90,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         return getDelegate().fakeOuterCompositeSerialize(body);
     }
 
@@ -108,7 +108,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return getDelegate().fakeOuterNumberSerialize(body);
     }
 
@@ -126,7 +126,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return getDelegate().fakeOuterStringSerialize(body);
     }
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApi.java
index b8788d88f31..8734c49ea19 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApi.java
@@ -66,7 +66,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body);
+    ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body);
 
 
     /**
@@ -82,7 +82,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body);
+    ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body);
 
 
     /**
@@ -98,7 +98,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body);
+    ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body);
 
 
     /**
@@ -114,7 +114,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body);
+    ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body);
 
 
     /**
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApiController.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApiController.java
index 705a9150f76..af0a6322c08 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApiController.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/api/FakeApiController.java
@@ -59,7 +59,7 @@ public class FakeApiController implements FakeApi {
      * @return Output boolean (status code 200)
      * @see FakeApi#fakeOuterBooleanSerialize
      */
-    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    public ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return delegate.fakeOuterBooleanSerialize(body);
     }
 
@@ -71,7 +71,7 @@ public class FakeApiController implements FakeApi {
      * @return Output composite (status code 200)
      * @see FakeApi#fakeOuterCompositeSerialize
      */
-    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    public ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         return delegate.fakeOuterCompositeSerialize(body);
     }
 
@@ -83,7 +83,7 @@ public class FakeApiController implements FakeApi {
      * @return Output number (status code 200)
      * @see FakeApi#fakeOuterNumberSerialize
      */
-    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    public ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return delegate.fakeOuterNumberSerialize(body);
     }
 
@@ -95,7 +95,7 @@ public class FakeApiController implements FakeApi {
      * @return Output string (status code 200)
      * @see FakeApi#fakeOuterStringSerialize
      */
-    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    public ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return delegate.fakeOuterStringSerialize(body);
     }
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/api/FakeApi.java
index 4d5a2b3f452..2e0ea64e1e9 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/api/FakeApi.java
@@ -81,7 +81,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -102,7 +102,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
@@ -132,7 +132,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -153,7 +153,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
index 849ea14cf07..029913c4504 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
@@ -75,7 +75,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<Boolean>> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Mono<Boolean> body, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<Boolean>> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Mono<Boolean> body, ServerWebExchange exchange) {
         return getDelegate().fakeOuterBooleanSerialize(body, exchange);
     }
 
@@ -93,7 +93,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<OuterComposite>> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody Mono<OuterComposite> body, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<OuterComposite>> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) Mono<OuterComposite> body, ServerWebExchange exchange) {
         return getDelegate().fakeOuterCompositeSerialize(body, exchange);
     }
 
@@ -111,7 +111,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<BigDecimal>> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody Mono<BigDecimal> body, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<BigDecimal>> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) Mono<BigDecimal> body, ServerWebExchange exchange) {
         return getDelegate().fakeOuterNumberSerialize(body, exchange);
     }
 
@@ -129,7 +129,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<String>> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody Mono<String> body, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<String>> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) Mono<String> body, ServerWebExchange exchange) {
         return getDelegate().fakeOuterStringSerialize(body, exchange);
     }
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/api/FakeApi.java
index c461ca3c95e..0be38f0541a 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/api/FakeApi.java
@@ -77,7 +77,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -96,7 +96,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
@@ -124,7 +124,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -143,7 +143,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/api/FakeApi.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/api/FakeApi.java
index 72de95191f9..036f0530d41 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/api/FakeApi.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/api/FakeApi.java
@@ -82,7 +82,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -102,7 +102,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
@@ -131,7 +131,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -151,7 +151,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/api/FakeApi.java
index f1eb1304433..073b8698935 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/api/FakeApi.java
@@ -77,7 +77,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/boolean",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody Boolean body) {
+    default ResponseEntity<Boolean> fakeOuterBooleanSerialize(@ApiParam(value = "Input boolean as post body"  )  @Valid @RequestBody(required = false) Boolean body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -96,7 +96,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/composite",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody OuterComposite body) {
+    default ResponseEntity<OuterComposite> fakeOuterCompositeSerialize(@ApiParam(value = "Input composite as post body"  )  @Valid @RequestBody(required = false) OuterComposite body) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
@@ -124,7 +124,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/number",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody BigDecimal body) {
+    default ResponseEntity<BigDecimal> fakeOuterNumberSerialize(@ApiParam(value = "Input number as post body"  )  @Valid @RequestBody(required = false) BigDecimal body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }
@@ -143,7 +143,7 @@ public interface FakeApi {
     @RequestMapping(value = "/fake/outer/string",
         produces = { "*/*" }, 
         method = RequestMethod.POST)
-    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody String body) {
+    default ResponseEntity<String> fakeOuterStringSerialize(@ApiParam(value = "Input string as post body"  )  @Valid @RequestBody(required = false) String body) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
     }