Polishing

spring-messaging/src/main/java/org/springframework/messaging/converter/MessageConversionException.java

@@ -36,6 +36,10 @@ public class MessageConversionException extends MessagingException {
 		super(description, cause);
 	}
 
+	public MessageConversionException(Message<?> failedMessage, String description) {
+		super(failedMessage, description);
+	}
+
 	public MessageConversionException(Message<?> failedMessage, String description, Throwable cause) {
 		super(failedMessage, description, cause);
 	}

spring-messaging/src/main/java/org/springframework/messaging/core/AbstractMessageReceivingTemplate.java

@@ -34,7 +34,7 @@ public abstract class AbstractMessageReceivingTemplate<D> extends AbstractMessag
 
 	@Override
 	public Message<?> receive() {
-		return receive(getRequiredDefaultDestination());
+		return doReceive(getRequiredDefaultDestination());
 	}
 
 	@Override
@@ -42,6 +42,12 @@ public abstract class AbstractMessageReceivingTemplate<D> extends AbstractMessag
 		return doReceive(destination);
 	}
 
+	/**
+	 * Actually receive a message from the given destination.
+	 * @param destination the target destination
+	 * @return the received message, possibly {@code null} if the message could not
+	 * be received, for example due to a timeout
+	 */
 	protected abstract Message<?> doReceive(D destination);
 
 
@@ -62,14 +68,19 @@ public abstract class AbstractMessageReceivingTemplate<D> extends AbstractMessag
 		}
 	}
 
+	/**
+	 * Convert from the given message to the given target class.
+	 * @param message the message to convert
+	 * @param targetClass the target class to convert the payload to
+	 * @return the converted payload of the reply message (never {@code null})
+	 */
 	@SuppressWarnings("unchecked")
 	protected <T> T doConvert(Message<?> message, Class<T> targetClass) {
 		MessageConverter messageConverter = getMessageConverter();
 		T value = (T) messageConverter.fromMessage(message, targetClass);
 		if (value == null) {
-			throw new MessageConversionException(message, "Unable to convert payload='"
-					+ message.getPayload() + "' to type='" + targetClass
-					+ "', converter=[" + messageConverter + "]", null);
+			throw new MessageConversionException(message, "Unable to convert payload [" + message.getPayload() +
+					"] to type [" + targetClass + "] using converter [" + messageConverter + "]");
 		}
 		return value;
 	}

spring-messaging/src/main/java/org/springframework/messaging/simp/config/MessageBrokerRegistry.java

@@ -43,14 +43,14 @@ public class MessageBrokerRegistry {
 
 	private StompBrokerRelayRegistration brokerRelayRegistration;
 
+	private final ChannelRegistration brokerChannelRegistration = new ChannelRegistration();
+
 	private String[] applicationDestinationPrefixes;
 
 	private String userDestinationPrefix;
 
 	private PathMatcher pathMatcher;
 
-	private ChannelRegistration brokerChannelRegistration = new ChannelRegistration();
-
 
 	public MessageBrokerRegistry(SubscribableChannel clientInboundChannel, MessageChannel clientOutboundChannel) {
 		Assert.notNull(clientInboundChannel);
@@ -59,6 +59,7 @@ public class MessageBrokerRegistry {
 		this.clientOutboundChannel = clientOutboundChannel;
 	}
 
+
 	/**
 	 * Enable a simple message broker and configure one or more prefixes to filter
 	 * destinations targeting the broker (e.g. destinations prefixed with "/topic").
@@ -80,6 +81,21 @@ public class MessageBrokerRegistry {
 		return this.brokerRelayRegistration;
 	}
 
+	/**
+	 * Customize the channel used to send messages from the application to the message
+	 * broker. By default, messages from the application to the message broker are sent
+	 * synchronously, which means application code sending a message will find out
+	 * if the message cannot be sent through an exception. However, this can be changed
+	 * if the broker channel is configured here with task executor properties.
+	 */
+	public ChannelRegistration configureBrokerChannel() {
+		return this.brokerChannelRegistration;
+	}
+
+	protected ChannelRegistration getBrokerChannelRegistration() {
+		return this.brokerChannelRegistration;
+	}
+
 	/**
 	 * Configure one or more prefixes to filter destinations targeting application
 	 * annotated methods. For example destinations prefixed with "/app" may be
@@ -95,6 +111,11 @@ public class MessageBrokerRegistry {
 		return this;
 	}
 
+	protected Collection<String> getApplicationDestinationPrefixes() {
+		return (this.applicationDestinationPrefixes != null ?
+				Arrays.asList(this.applicationDestinationPrefixes) : null);
+	}
+
 	/**
 	 * Configure the prefix used to identify user destinations. User destinations
 	 * provide the ability for a user to subscribe to queue names unique to their
@@ -112,24 +133,24 @@ public class MessageBrokerRegistry {
 		return this;
 	}
 
+	protected String getUserDestinationPrefix() {
+		return this.userDestinationPrefix;
+	}
+
 	/**
 	 * Configure the PathMatcher to use to match the destinations of incoming
 	 * messages to {@code @MessageMapping} and {@code @SubscribeMapping} methods.
-	 *
 	 * <p>By default {@link org.springframework.util.AntPathMatcher} is configured.
 	 * However applications may provide an {@code AntPathMatcher} instance
 	 * customized to use "." (commonly used in messaging) instead of "/" as path
 	 * separator or provide a completely different PathMatcher implementation.
-	 *
 	 * <p>Note that the configured PathMatcher is only used for matching the
 	 * portion of the destination after the configured prefix. For example given
 	 * application destination prefix "/app" and destination "/app/price.stock.**",
 	 * the message might be mapped to a controller with "price" and "stock.**"
 	 * as its type and method-level mappings respectively.
-	 *
 	 * <p>When the simple broker is enabled, the PathMatcher configured here is
 	 * also used to match message destinations when brokering messages.
-	 *
 	 * @since 4.1
 	 */
 	public MessageBrokerRegistry setPathMatcher(PathMatcher pathMatcher) {
@@ -137,19 +158,13 @@ public class MessageBrokerRegistry {
 		return this;
 	}
 
-	/**
-	 * Customize the channel used to send messages from the application to the message
-	 * broker. By default messages from the application to the message broker are sent
-	 * synchronously, which means application code sending a message will find out
-	 * if the message cannot be sent through an exception. However, this can be changed
-	 * if the broker channel is configured here with task executor properties.
-	 */
-	public ChannelRegistration configureBrokerChannel() {
-		return this.brokerChannelRegistration;
+	protected PathMatcher getPathMatcher() {
+		return this.pathMatcher;
 	}
 
+
 	protected SimpleBrokerMessageHandler getSimpleBroker(SubscribableChannel brokerChannel) {
-		if ((this.simpleBrokerRegistration == null) && (this.brokerRelayRegistration == null)) {
+		if (this.simpleBrokerRegistration == null && this.brokerRelayRegistration == null) {
 			enableSimpleBroker();
 		}
 		if (this.simpleBrokerRegistration != null) {
@@ -167,21 +182,4 @@ public class MessageBrokerRegistry {
 		return null;
 	}
 
-	protected Collection<String> getApplicationDestinationPrefixes() {
-		return (this.applicationDestinationPrefixes != null)
-				? Arrays.asList(this.applicationDestinationPrefixes) : null;
-	}
-
-	protected String getUserDestinationPrefix() {
-		return this.userDestinationPrefix;
-	}
-
-	protected PathMatcher getPathMatcher() {
-		return this.pathMatcher;
-	}
-
-	protected ChannelRegistration getBrokerChannelRegistration() {
-		return this.brokerChannelRegistration;
-	}
-
 }

spring-messaging/src/main/java/org/springframework/messaging/simp/config/SimpleBrokerRegistration.java

@@ -28,12 +28,10 @@ import org.springframework.messaging.simp.broker.SimpleBrokerMessageHandler;
  */
 public class SimpleBrokerRegistration extends AbstractBrokerRegistration {
 
-
 	public SimpleBrokerRegistration(SubscribableChannel inChannel, MessageChannel outChannel, String[] prefixes) {
 		super(inChannel, outChannel, prefixes);
 	}
 
-
 	@Override
 	protected SimpleBrokerMessageHandler getMessageHandler(SubscribableChannel brokerChannel) {
 		return new SimpleBrokerMessageHandler(getClientInboundChannel(),

spring-messaging/src/main/java/org/springframework/messaging/simp/config/StompBrokerRelayRegistration.java

@@ -74,12 +74,10 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 		return this;
 	}
 
-
 	/**
 	 * Set the login to use when creating connections to the STOMP broker on
 	 * behalf of connected clients.
-	 * <p>
-	 * By default this is set to "guest".
+	 * <p>By default this is set to "guest".
 	 */
 	public StompBrokerRelayRegistration setClientLogin(String login) {
 		Assert.hasText(login, "clientLogin must not be empty");
@@ -90,8 +88,7 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 	/**
 	 * Set the passcode to use when creating connections to the STOMP broker on
 	 * behalf of connected clients.
-	 * <p>
-	 * By default this is set to "guest".
+	 * <p>By default this is set to "guest".
 	 */
 	public StompBrokerRelayRegistration setClientPasscode(String passcode) {
 		Assert.hasText(passcode, "clientPasscode must not be empty");
@@ -103,8 +100,7 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 	 * Set the login for the shared "system" connection used to send messages to
 	 * the STOMP broker from within the application, i.e. messages not associated
 	 * with a specific client session (e.g. REST/HTTP request handling method).
-	 * <p>
-	 * By default this is set to "guest".
+	 * <p>By default this is set to "guest".
 	 */
 	public StompBrokerRelayRegistration setSystemLogin(String login) {
 		Assert.hasText(login, "systemLogin must not be empty");
@@ -116,8 +112,7 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 	 * Set the passcode for the shared "system" connection used to send messages to
 	 * the STOMP broker from within the application, i.e. messages not associated
 	 * with a specific client session (e.g. REST/HTTP request handling method).
-	 * <p>
-	 * By default this is set to "guest".
+	 * <p>By default this is set to "guest".
 	 */
 	public StompBrokerRelayRegistration setSystemPasscode(String passcode) {
 		Assert.hasText(passcode, "systemPasscode must not be empty");
@@ -173,7 +168,6 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 
 
 	protected StompBrokerRelayMessageHandler getMessageHandler(SubscribableChannel brokerChannel) {
-
 		StompBrokerRelayMessageHandler handler = new StompBrokerRelayMessageHandler(getClientInboundChannel(),
 				getClientOutboundChannel(), brokerChannel, getDestinationPrefixes());
 

spring-messaging/src/main/java/org/springframework/messaging/support/AbstractHeaderMapper.java

@@ -38,10 +38,11 @@ public abstract class AbstractHeaderMapper<T> implements HeaderMapper<T> {
 
 	private String outboundPrefix = "";
 
+
 	/**
 	 * Specify a prefix to be appended to the message header name for any
-	 * user-defined property that is being mapped into the MessageHeaders. The
-	 * default is an empty string (no prefix).
+	 * user-defined property that is being mapped into the MessageHeaders.
+	 * The default is an empty String (no prefix).
 	 */
 	public void setInboundPrefix(String inboundPrefix) {
 		this.inboundPrefix = (inboundPrefix != null ? inboundPrefix : "");
@@ -50,15 +51,16 @@ public abstract class AbstractHeaderMapper<T> implements HeaderMapper<T> {
 	/**
 	 * Specify a prefix to be appended to the protocol property name for any
 	 * user-defined message header that is being mapped into the protocol-specific
-	 * Message. The default is an empty string (no prefix).
+	 * Message. The default is an empty String (no prefix).
 	 */
 	public void setOutboundPrefix(String outboundPrefix) {
 		this.outboundPrefix = (outboundPrefix != null ? outboundPrefix : "");
 	}
 
+
 	/**
-	 * Generate the name to use to set the header defined by the specified {@code headerName} to
-	 * the protocol specific message.
+	 * Generate the name to use to set the header defined by the specified
+	 * {@code headerName} to the protocol specific message.
 	 * @see #setOutboundPrefix
 	 */
 	protected String fromHeaderName(String headerName) {
@@ -70,8 +72,8 @@ public abstract class AbstractHeaderMapper<T> implements HeaderMapper<T> {
 	}
 
 	/**
-	 * Generate the name to use to set the header defined by the specified {@code propertyName} to
-	 * the {@link MessageHeaders} instance.
+	 * Generate the name to use to set the header defined by the specified
+	 * {@code propertyName} to the {@link MessageHeaders} instance.
 	 * @see #setInboundPrefix(String)
 	 */
 	protected String toHeaderName(String propertyName) {
@@ -83,8 +85,8 @@ public abstract class AbstractHeaderMapper<T> implements HeaderMapper<T> {
 	}
 
 	/**
-	 * Return the header value or {@code null} if it does not exist or does not match
-	 * the requested {@code type}.
+	 * Return the header value, or {@code null} if it does not exist
+	 * or does not match the requested {@code type}.
 	 */
 	protected <V> V getHeaderIfAvailable(Map<String, Object> headers, String name, Class<V> type) {
 		Object value = headers.get(name);
@@ -102,4 +104,5 @@ public abstract class AbstractHeaderMapper<T> implements HeaderMapper<T> {
 			return type.cast(value);
 		}
 	}
+
 }

spring-messaging/src/main/java/org/springframework/messaging/support/ExecutorChannelInterceptor.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2002-2014 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
+ *
+ *      http://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.messaging.support;
 
 import org.springframework.messaging.Message;
@@ -6,8 +22,8 @@ import org.springframework.messaging.MessageHandler;
 
 /**
  * An extension of {@link ChannelInterceptor} with callbacks to intercept the
- * asynchronous sending of a {@link org.springframework.messaging.Message} to a
- * specific subscriber through an {@link java.util.concurrent.Executor}.
+ * asynchronous sending of a {@link org.springframework.messaging.Message} to
+ * a specific subscriber through an {@link java.util.concurrent.Executor}.
  * Supported on {@link org.springframework.messaging.MessageChannel}
  * implementations that can be configured with an Executor.
  *
@@ -21,7 +37,6 @@ public interface ExecutorChannelInterceptor extends ChannelInterceptor {
 	 * calling the target MessageHandler to handle the message. Allows for
 	 * modification of the Message if necessary or when {@code null} is returned
 	 * the MessageHandler is not invoked.
-	 *
 	 * @param message the message to be handled
 	 * @param channel the channel on which the message was sent to
 	 * @param handler the target handler to handle the message
@@ -33,10 +48,8 @@ public interface ExecutorChannelInterceptor extends ChannelInterceptor {
 	 * Invoked inside the {@link Runnable} submitted to the Executor after calling
 	 * the target MessageHandler regardless of the outcome (i.e. Exception raised
 	 * or not) thus allowing for proper resource cleanup.
-	 *
 	 * <p>Note that this will be invoked only if beforeHandle successfully completed
 	 * and returned a Message, i.e. it did not return {@code null}.
-	 *
 	 * @param message the message handled
 	 * @param channel the channel on which the message was sent to
 	 * @param handler the target handler that handled the message

spring-messaging/src/main/java/org/springframework/messaging/support/GenericMessage.java

@@ -22,6 +22,7 @@ import java.util.Map;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHeaders;
 import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
 
 /**
  * An implementation of {@link Message} with a generic payload.
@@ -90,12 +91,14 @@ public class GenericMessage<T> implements Message<T>, Serializable {
 		if (!(other instanceof GenericMessage)) {
 			return false;
 		}
-		GenericMessage<?> otherMessage = (GenericMessage<?>) other;
-		return (this.payload.equals(otherMessage.payload) && this.headers.equals(otherMessage.headers));
+		GenericMessage<?> otherMsg = (GenericMessage<?>) other;
+		// Using nullSafeEquals for proper array equals comparisons
+		return (ObjectUtils.nullSafeEquals(this.payload, otherMsg.payload) && this.headers.equals(otherMsg.headers));
 	}
 
 	public int hashCode() {
-		return (this.payload.hashCode() * 23 + this.headers.hashCode());
+		// Using nullSafeHashCode for proper array hashCode handling
+		return (ObjectUtils.nullSafeHashCode(this.payload) * 23 + this.headers.hashCode());
 	}
 
 	public String toString() {