fix: unwrap a WebAsyncTask return type

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/configuration/SpringDocConfiguration.java

@@ -132,6 +132,7 @@
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.context.request.async.DeferredResult;
+import org.springframework.web.context.request.async.WebAsyncTask;
 
 import static org.springdoc.core.utils.Constants.GLOBAL_OPEN_API_CUSTOMIZER;
 import static org.springdoc.core.utils.Constants.SPRINGDOC_DEPRECATING_CONVERTER_ENABLED;
@@ -163,7 +164,8 @@ public class SpringDocConfiguration {
 		getConfig().replaceWithSchema(ObjectNode.class, new ObjectSchema())
 				.replaceWithClass(Charset.class, String.class)
 				.addResponseWrapperToIgnore(DeferredResult.class)
-				.addResponseWrapperToIgnore(Future.class);
+				.addResponseWrapperToIgnore(Future.class)
+				.addResponseWrapperToIgnore(WebAsyncTask.class);
 	}
 
 	/**

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app273/HelloController.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2019-2026 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.v30.app273;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.request.async.WebAsyncTask;
+
+/**
+ * A controller that returns an asynchronous result with a timeout.
+ */
+@RestController
+public class HelloController {
+
+	@GetMapping("/hello")
+	public WebAsyncTask<String> hello() {
+		return new WebAsyncTask<>(1000L, () -> "hello");
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app273/SpringDocApp273Test.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2019-2026 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.v30.app273;
+
+import test.org.springdoc.api.v30.AbstractSpringDocV30Test;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * A WebAsyncTask return type is a response wrapper, not a schema.
+ */
+public class SpringDocApp273Test extends AbstractSpringDocV30Test {
+
+	@SpringBootApplication
+	static class SpringDocTestApp {
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app273/HelloController.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2019-2026 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.v31.app273;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.request.async.WebAsyncTask;
+
+/**
+ * A controller that returns an asynchronous result with a timeout.
+ */
+@RestController
+public class HelloController {
+
+	@GetMapping("/hello")
+	public WebAsyncTask<String> hello() {
+		return new WebAsyncTask<>(1000L, () -> "hello");
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app273/SpringDocApp273Test.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2019-2026 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.v31.app273;
+
+import test.org.springdoc.api.v31.AbstractSpringDocV31Test;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * A WebAsyncTask return type is a response wrapper, not a schema.
+ */
+public class SpringDocApp273Test extends AbstractSpringDocV31Test {
+
+	@SpringBootApplication
+	static class SpringDocTestApp {
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/resources/results/3.0.1/app273.json

@@ -0,0 +1,32 @@
+{
+  "openapi" : "3.0.1",
+  "info" : {
+    "title" : "OpenAPI definition",
+    "version" : "v0"
+  },
+  "servers" : [ {
+    "url" : "http://localhost",
+    "description" : "Generated server url"
+  } ],
+  "paths" : {
+    "/hello" : {
+      "get" : {
+        "tags" : [ "hello-controller" ],
+        "operationId" : "hello",
+        "responses" : {
+          "200" : {
+            "description" : "OK",
+            "content" : {
+              "*/*" : {
+                "schema" : {
+                  "type" : "string"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components" : { }
+}

springdoc-openapi-starter-webmvc-api/src/test/resources/results/3.1.0/app273.json

@@ -0,0 +1,32 @@
+{
+  "openapi" : "3.1.0",
+  "info" : {
+    "title" : "OpenAPI definition",
+    "version" : "v0"
+  },
+  "servers" : [ {
+    "url" : "http://localhost",
+    "description" : "Generated server url"
+  } ],
+  "paths" : {
+    "/hello" : {
+      "get" : {
+        "tags" : [ "hello-controller" ],
+        "operationId" : "hello",
+        "responses" : {
+          "200" : {
+            "description" : "OK",
+            "content" : {
+              "*/*" : {
+                "schema" : {
+                  "type" : "string"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components" : { }
+}