[18929] fix missing JsonIgnoreProperties import in oneOf interface file

Author: ondrej-simon

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

@@ -2301,7 +2301,7 @@ private boolean shouldBeImplicitHeader(CodegenParameter parameter) {
     @Override
     public void addImportsToOneOfInterface(List<Map<String, String>> imports) {
         if (jackson) {
-            for (String i : Arrays.asList("JsonSubTypes", "JsonTypeInfo")) {
+            for (String i : Arrays.asList("JsonSubTypes", "JsonTypeInfo", "JsonIgnoreProperties")) {
                 Map<String, String> oneImport = new HashMap<>();
                 oneImport.put("import", importMapping.get(i));
                 if (!imports.contains(oneImport)) {

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

@@ -5002,4 +5002,14 @@ public void testEnumUnknownDefaultCaseDeserializationNotSet_issue13241() throws
             .assertMethod("build")
             .doesNotHaveAnnotation("Deprecated");
     }
+
+    @Test
+    public void shouldAddJsonIgnorePropertiesImportWhenUsingOneOfWithinOneOf_issue18929() throws IOException {
+        final SpringCodegen codegen = new SpringCodegen();
+
+        final Map<String, File> files = generateFiles(codegen, "src/test/resources/3_0/spring/issue_18929.yaml");
+
+        JavaFileAssert.assertThat(files.get("RequestTwoSchemaNestedOneOf.java"))
+                .hasImports("com.fasterxml.jackson.annotation.JsonIgnoreProperties");
+    }
 }

modules/openapi-generator/src/test/resources/3_0/spring/issue_18929.yaml

@@ -0,0 +1,71 @@
+openapi: 3.0.3
+info:
+  title: oneOf within oneOf
+  version: 7.7.0-SNAPSHOT
+paths:
+  /oneOf-within-oneOf-test:
+    post:
+      operationId: 'oneOfWithinOneOfTest'
+      requestBody:
+        content:
+          application/json:
+            schema:
+              oneOf:
+                - $ref: '#/components/schemas/RequestTwoSchema'
+                - $ref: '#/components/schemas/RequestOneSchema'
+      responses:
+        '201':
+          description: The request was successful and the resource has been created.
+          content:
+            application/json:
+              schema:
+                type: string
+components:
+  schemas:
+    AbstractNestedSchema:
+      type: object
+      discriminator:
+        propertyName: type
+        mapping:
+          NESTED_ONE: '#/components/schemas/NestedOneSchema'
+          NESTED_TWO: '#/components/schemas/NestedTwoSchema'
+      required:
+        - type
+      properties:
+        type:
+          type: string
+    NestedOneSchema:
+      type: object
+      allOf:
+        - $ref: '#/components/schemas/AbstractNestedSchema'
+    AbstractRequestSchema:
+      type: object
+      discriminator:
+        propertyName: type
+        mapping:
+          REQUEST_ONE: '#/components/schemas/RequestOneSchema'
+          REQUEST_TWO: '#/components/schemas/RequestTwoSchema'
+      required:
+        - type
+      properties:
+        type:
+          type: string
+    RequestTwoSchema:
+      type: object
+      allOf:
+        - $ref: '#/components/schemas/AbstractRequestSchema'
+      required:
+        - nested
+      properties:
+        nested:
+          oneOf:
+            - $ref: '#/components/schemas/NestedTwoSchema'
+            - $ref: '#/components/schemas/NestedOneSchema'
+    RequestOneSchema:
+      type: object
+      allOf:
+        - $ref: '#/components/schemas/AbstractRequestSchema'
+    NestedTwoSchema:
+      type: object
+      allOf:
+        - $ref: '#/components/schemas/AbstractNestedSchema'