fix for issue #2733

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/ConverterUtils.java

@@ -102,6 +102,15 @@ public static boolean isResponseTypeWrapper(Class<?> rawClass) {
 		return RESULT_WRAPPERS_TO_IGNORE.stream().anyMatch(clazz -> clazz.isAssignableFrom(rawClass));
 	}
 
+	/**
+	 * Is exact class
+	 * @param rawClass the raw class
+	 * true if the class is in the list of classes to ignore
+	 */
+	public static boolean isExactClass(Class<?> rawClass) {
+		return RESULT_WRAPPERS_TO_IGNORE.stream().anyMatch(clazz -> clazz == rawClass);
+	}
+
 	/**
 	 * Is response type to ignore boolean.
 	 *

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/ResponseSupportConverter.java

@@ -35,9 +35,7 @@
 import io.swagger.v3.oas.models.media.StringSchema;
 import org.springdoc.core.providers.ObjectMapperProvider;
 
-import static org.springdoc.core.converters.ConverterUtils.isFluxTypeWrapper;
-import static org.springdoc.core.converters.ConverterUtils.isResponseTypeToIgnore;
-import static org.springdoc.core.converters.ConverterUtils.isResponseTypeWrapper;
+import static org.springdoc.core.converters.ConverterUtils.*;
 
 /**
  * The type Response support converter.
@@ -65,7 +63,7 @@ public Schema resolve(AnnotatedType type, ModelConverterContext context, Iterato
 		if (javaType != null) {
 			Class<?> cls = javaType.getRawClass();
 			if (isResponseTypeWrapper(cls) && !isFluxTypeWrapper(cls)) {
-				JavaType innerType = javaType.getBindings().getBoundType(0);
+				JavaType innerType = resolveInnerType(javaType);
 				if (innerType == null)
 					return new StringSchema();
 				return context.resolve(new AnnotatedType(innerType)
@@ -79,4 +77,12 @@ else if (isResponseTypeToIgnore(cls))
 		return (chain.hasNext()) ? chain.next().resolve(type, context, chain) : null;
 	}
 
+	private JavaType resolveInnerType(JavaType javaType) {
+		while(!isExactClass(javaType.getRawClass())) {
+			javaType = javaType.getSuperClass();
+		}
+
+		return javaType.getBindings().getBoundType(0);
+	}
+
 }

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/java/test/org/springdoc/api/app227/HelloController.java

@@ -0,0 +1,35 @@
+/*
+ *
+ *  * Copyright 2019-2024 the original author or authors.
+ *  *
+ *  * 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 test.org.springdoc.api.app227;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import test.org.springdoc.api.app227.model.Item;
+import test.org.springdoc.api.app227.wrapper.ResponseEntityWrapper;
+
+@RestController
+public class HelloController {
+
+	@GetMapping("/persons")
+	public ResponseEntityWrapper<String> persons() {
+		return new ResponseEntityWrapper<>(Item.fromPayload("1", "OK", "String"), HttpStatus.OK);
+	}
+
+}

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/java/test/org/springdoc/api/app227/SpringDocApp227Test.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * Copyright 2019-2024 the original author or authors.
+ *  *
+ *  * 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 test.org.springdoc.api.app227;
+
+import org.junit.jupiter.api.Test;
+import org.springdoc.core.utils.Constants;
+import org.springframework.test.context.TestPropertySource;
+import test.org.springdoc.api.AbstractSpringDocTest;
+
+import static org.hamcrest.Matchers.is;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
+
+@TestPropertySource(properties = {
+		"management.endpoints.enabled-by-default=true",
+})
+public class SpringDocApp227Test extends AbstractSpringDocTest {
+
+	@Test
+	public void testApp() throws Exception {
+		mockMvc.perform(get(Constants.DEFAULT_API_DOCS_URL))
+				.andExpect(status().isOk())
+				.andExpect(jsonPath("$.openapi", is("3.0.1")))
+				.andExpect(content().json(getContent("results/app227.json"), true));
+	}
+
+}

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/java/test/org/springdoc/api/app227/SpringDocTestApp.java

@@ -0,0 +1,11 @@
+package test.org.springdoc.api.app227;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringDocTestApp {
+	public static void main(String[] args) {
+		SpringApplication.run(SpringDocTestApp.class, args);
+	}
+}

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/java/test/org/springdoc/api/app227/model/Item.java

@@ -0,0 +1,14 @@
+package test.org.springdoc.api.app227.model;
+
+/**
+ * Base item
+ */
+public record Item<T>(String id, String type, T resource) {
+
+    /**
+     * Create Item object
+     */
+    public static <T> Item<T> fromPayload(String id, String type, T payload) {
+        return new Item<>(id, type, payload);
+    }
+}

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/java/test/org/springdoc/api/app227/wrapper/ResponseEntityWrapper.java

@@ -0,0 +1,11 @@
+package test.org.springdoc.api.app227.wrapper;
+
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import test.org.springdoc.api.app227.model.Item;
+
+public class ResponseEntityWrapper<T> extends ResponseEntity<Item<T>> {
+    public ResponseEntityWrapper(Item<T> body, HttpStatusCode status) {
+        super(body, status);
+    }
+}

springdoc-openapi-tests/springdoc-openapi-actuator-webmvc-tests/src/test/resources/results/app227.json

@@ -0,0 +1,53 @@
+{
+  "openapi": "3.0.1",
+  "info": {
+    "title": "OpenAPI definition",
+    "version": "v0"
+  },
+  "servers": [
+    {
+      "url": "http://localhost",
+      "description": "Generated server url"
+    }
+  ],
+  "paths": {
+    "/persons": {
+      "get": {
+        "tags": [
+          "hello-controller"
+        ],
+        "operationId": "persons",
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "$ref": "#/components/schemas/ItemString"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components": {
+    "schemas": {
+      "ItemString": {
+        "type": "object",
+        "properties": {
+          "id": {
+            "type": "string"
+          },
+          "type": {
+            "type": "string"
+          },
+          "resource": {
+            "type": "string"
+          }
+        }
+      }
+    }
+  }
+}