Polish

spring-web/src/main/java/org/springframework/http/server/reactive/ServletHttpHandlerAdapter.java

@@ -18,6 +18,8 @@ package org.springframework.http.server.reactive;
 
 import java.io.IOException;
 import javax.servlet.AsyncContext;
+import javax.servlet.AsyncEvent;
+import javax.servlet.AsyncListener;
 import javax.servlet.Servlet;
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletRequest;
@@ -106,6 +108,8 @@ public class ServletHttpHandlerAdapter implements Servlet {
 		ServerHttpRequest httpRequest = createRequest(((HttpServletRequest) request), asyncContext);
 		ServerHttpResponse httpResponse = createResponse(((HttpServletResponse) response), asyncContext);
 
+		asyncContext.addListener(TIMEOUT_LISTENER);
+
 		HandlerResultSubscriber subscriber = new HandlerResultSubscriber(asyncContext);
 		this.httpHandler.handle(httpRequest, httpResponse).subscribe(subscriber);
 	}
@@ -146,14 +150,40 @@ public class ServletHttpHandlerAdapter implements Servlet {
 	}
 
 
+	private final static AsyncListener TIMEOUT_LISTENER = new AsyncListener() {
+
+		@Override
+		public void onTimeout(AsyncEvent event) throws IOException {
+			event.getAsyncContext().complete();
+		}
+
+		@Override
+		public void onError(AsyncEvent event) throws IOException {
+			event.getAsyncContext().complete();
+		}
+
+		@Override
+		public void onStartAsync(AsyncEvent event) throws IOException {
+			// no-op
+		}
+
+		@Override
+		public void onComplete(AsyncEvent event) throws IOException {
+			// no-op
+		}
+	};
+
+
 	private class HandlerResultSubscriber implements Subscriber<Void> {
 
 		private final AsyncContext asyncContext;
 
+
 		public HandlerResultSubscriber(AsyncContext asyncContext) {
 			this.asyncContext = asyncContext;
 		}
 
+
 		@Override
 		public void onSubscribe(Subscription subscription) {
 			subscription.request(Long.MAX_VALUE);
@@ -166,32 +196,33 @@ public class ServletHttpHandlerAdapter implements Servlet {
 
 		@Override
 		public void onError(Throwable ex) {
-			ServletRequest request = getRequest();
-			if (request != null && request.isAsyncStarted()) {
+			runIfAsyncNotComplete(() -> {
 				logger.error("Could not complete request", ex);
 				HttpServletResponse response = (HttpServletResponse) this.asyncContext.getResponse();
 				response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 				this.asyncContext.complete();
-			}
+			});
 		}
 
 		@Override
 		public void onComplete() {
-			ServletRequest request = getRequest();
-			if (request != null && request.isAsyncStarted()) {
+			runIfAsyncNotComplete(() -> {
 				logger.debug("Successfully completed request");
 				this.asyncContext.complete();
-			}
+			});
 		}
 
-		private ServletRequest getRequest() {
-			ServletRequest request = null;
+		private void runIfAsyncNotComplete(Runnable task) {
 			try {
-				request = this.asyncContext.getRequest();
-			} catch (IllegalStateException ignore) {
-				// AsyncContext has been recycled and should not be used
+				if (this.asyncContext.getRequest().isAsyncStarted()) {
+					task.run();
+				}
+			}
+			catch (IllegalStateException ex) {
+				// Ignore:
+				// AsyncContext recycled and should not be used
+				// e.g. TIMEOUT_LISTENER (above) may have completed the AsyncContext
 			}
-			return request;
 		}
 	}
 

spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java

@@ -180,13 +180,11 @@ public class ServletServerHttpResponse extends AbstractListenerServerHttpRespons
 			Throwable ex = event.getThrowable();
 			ex = (ex != null ? ex : new IllegalStateException("Async operation timeout."));
 			handleError(ex);
-			event.getAsyncContext().complete();
 		}
 
 		@Override
 		public void onError(AsyncEvent event) {
 			handleError(event.getThrowable());
-			event.getAsyncContext().complete();
 		}
 
 		void handleError(Throwable ex) {