Align 5.3.x with 6.1.x

In preparation for a larger update, start by aligning with
6.1.x, which includes changes for gh-32042 and gh-30232.

See gh-32342

spring-web/src/main/java/org/springframework/web/context/request/async/StandardServletAsyncWebRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -28,11 +28,12 @@ import javax.servlet.AsyncListener;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.web.context.request.ServletWebRequest;
 
 /**
- * A Servlet 3.0 implementation of {@link AsyncWebRequest}.
+ * A Servlet implementation of {@link AsyncWebRequest}.
  *
  * <p>The servlet and all filters involved in an async request must have async
  * support enabled using the Servlet API or by adding an
@@ -44,11 +45,7 @@ import org.springframework.web.context.request.ServletWebRequest;
  */
 public class StandardServletAsyncWebRequest extends ServletWebRequest implements AsyncWebRequest, AsyncListener {
 
-	private Long timeout;
-
-	private AsyncContext asyncContext;
-
-	private AtomicBoolean asyncCompleted = new AtomicBoolean();
+	private final AtomicBoolean asyncCompleted = new AtomicBoolean();
 
 	private final List<Runnable> timeoutHandlers = new ArrayList<>();
 
@@ -56,6 +53,12 @@ public class StandardServletAsyncWebRequest extends ServletWebRequest implements
 
 	private final List<Runnable> completionHandlers = new ArrayList<>();
 
+	@Nullable
+	private Long timeout;
+
+	@Nullable
+	private AsyncContext asyncContext;
+
 
 	/**
 	 * Create a new instance for the given request/response pair.

spring-web/src/main/java/org/springframework/web/context/request/async/WebAsyncManager.java

@@ -22,7 +22,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Callable;
 import java.util.concurrent.Future;
-import java.util.concurrent.RejectedExecutionException;
 
 import javax.servlet.http.HttpServletRequest;
 
@@ -36,6 +35,7 @@ import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.web.context.request.RequestAttributes;
 import org.springframework.web.context.request.async.DeferredResult.DeferredResultHandler;
+import org.springframework.web.util.DisconnectedClientHelper;
 
 /**
  * The central class for managing asynchronous request processing, mainly intended
@@ -69,6 +69,16 @@ public final class WebAsyncManager {
 
 	private static final Log logger = LogFactory.getLog(WebAsyncManager.class);
 
+	/**
+	 * Log category to use for network failure after a client has gone away.
+	 * @see DisconnectedClientHelper
+	 */
+	private static final String DISCONNECTED_CLIENT_LOG_CATEGORY =
+			"org.springframework.web.server.DisconnectedClient";
+
+	private static final DisconnectedClientHelper disconnectedClientHelper =
+			new DisconnectedClientHelper(DISCONNECTED_CLIENT_LOG_CATEGORY);
+
 	private static final CallableProcessingInterceptor timeoutCallableInterceptor =
 			new TimeoutCallableProcessingInterceptor();
 
@@ -351,10 +361,9 @@ public final class WebAsyncManager {
 			});
 			interceptorChain.setTaskFuture(future);
 		}
-		catch (RejectedExecutionException ex) {
+		catch (Throwable ex) {
 			Object result = interceptorChain.applyPostProcess(this.asyncWebRequest, callable, ex);
 			setConcurrentResultAndDispatch(result);
-			throw ex;
 		}
 	}
 
@@ -395,9 +404,14 @@ public final class WebAsyncManager {
 			return;
 		}
 
+		if (result instanceof Exception) {
+			if (disconnectedClientHelper.checkAndLogClientDisconnectedException((Exception) result)) {
+				return;
+			}
+		}
+
 		if (logger.isDebugEnabled()) {
-			boolean isError = result instanceof Throwable;
-			logger.debug("Async " + (isError ? "error" : "result set") +
+			logger.debug("Async " + (this.errorHandlingInProgress ? "error" : "result set") +
 					", dispatch to " + formatUri(this.asyncWebRequest));
 		}
 		this.asyncWebRequest.dispatch();

spring-web/src/main/java/org/springframework/web/util/DisconnectedClientHelper.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright 2002-2024 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 org.springframework.web.util;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import org.springframework.core.NestedExceptionUtils;
+import org.springframework.util.Assert;
+
+/**
+ * Utility methods to assist with identifying and logging exceptions that indicate
+ * the client has gone away. Such exceptions fill logs with unnecessary stack
+ * traces. The utility methods help to log a single line message at DEBUG level,
+ * and a full stacktrace at TRACE level.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.3.33
+ */
+public class DisconnectedClientHelper {
+
+	private static final Set<String> EXCEPTION_PHRASES =
+			new HashSet<>(Arrays.asList("broken pipe", "connection reset by peer"));
+
+	private static final Set<String> EXCEPTION_TYPE_NAMES =
+			new HashSet<>(Arrays.asList("AbortedException", "ClientAbortException", "EOFException", "EofException"));
+
+	private final Log logger;
+
+
+	public DisconnectedClientHelper(String logCategory) {
+		Assert.notNull(logCategory, "'logCategory' is required");
+		this.logger = LogFactory.getLog(logCategory);
+	}
+
+
+	/**
+	 * Check via  {@link #isClientDisconnectedException} if the exception
+	 * indicates the remote client disconnected, and if so log a single line
+	 * message when DEBUG is on, and a full stacktrace when TRACE is on for
+	 * the configured logger.
+ 	 */
+	public boolean checkAndLogClientDisconnectedException(Throwable ex) {
+		if (isClientDisconnectedException(ex)) {
+			if (logger.isTraceEnabled()) {
+				logger.trace("Looks like the client has gone away", ex);
+			}
+			else if (logger.isDebugEnabled()) {
+				logger.debug("Looks like the client has gone away: " + ex +
+						" (For a full stack trace, set the log category '" + logger + "' to TRACE level.)");
+			}
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * Whether the given exception indicates the client has gone away.
+	 * Known cases covered:
+	 * <ul>
+	 * <li>ClientAbortException or EOFException for Tomcat
+	 * <li>EofException for Jetty
+	 * <li>IOException "Broken pipe" or "connection reset by peer"
+	 * </ul>
+	 */
+	public static boolean isClientDisconnectedException(Throwable ex) {
+		String message = NestedExceptionUtils.getMostSpecificCause(ex).getMessage();
+		if (message != null) {
+			String text = message.toLowerCase();
+			for (String phrase : EXCEPTION_PHRASES) {
+				if (text.contains(phrase)) {
+					return true;
+				}
+			}
+		}
+		return EXCEPTION_TYPE_NAMES.contains(ex.getClass().getSimpleName());
+	}
+
+}