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 <div class="wiki-content maincontent"><p><a shape="rect" class="external-link" href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/net/JMSAppender.html">Log4j JMS appender</a> can be used to send your log messages to JMS broker. To use ActiveMQ as a destination of your messages, you need to configure JMS appender properly. The code sample below shows example configuration:</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 log4j.rootLogger=INFO, stdout, jms

 ## Be sure that ActiveMQ messages are not logged to 'jms' appender
 log4j.logger.org.apache.activemq=INFO, stdout

 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d %-5p %c - %m%n

 ## Configure 'jms' appender. You'll also need jndi.properties file in order to make it work
 log4j.appender.jms=org.apache.log4j.net.JMSAppender
 log4j.appender.jms.InitialContextFactoryName=org.apache.activemq.jndi.ActiveMQInitialContextFactory
 log4j.appender.jms.ProviderURL=tcp://localhost:61616
 log4j.appender.jms.TopicBindingName=logTopic
 log4j.appender.jms.TopicConnectionFactoryBindingName=ConnectionFactory
 </pre>
 </div></div>

 <p>The important thing is not to send ActiveMQ logs to JMS appender, as it can cause errors since the broker will want to log before the connection is established. You will also need a JNDI configuration, so that appender can find appropriate topic to send log messages to. The example <code>jndi.properties</code> file can look like this:</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 topic.logTopic=logTopic
 </pre>
 </div></div>

 <p>Finally, you can subscribe to the topic and listen for log messages:</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 public class Log4jJMSAppenderExample implements MessageListener {

 	public Log4jJMSAppenderExample() throws Exception {
 		// create a logTopic topic consumer
 		ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
 		Connection conn = factory.createConnection();
 		Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
 		conn.start();
 		MessageConsumer consumer = sess.createConsumer(sess.createTopic("logTopic"));
 		consumer.setMessageListener(this);
 		// log a message
 		Logger log = Logger.getLogger(Log4jJMSAppenderExample.class);
 		log.info("Test log");
 		// clean up
 		Thread.sleep(1000);
 		consumer.close();
 		sess.close();
 		conn.close();
 		System.exit(1);
 	}

 	public static void main(String[] args) throws Exception {
 		new Log4jJMSAppenderExample();
 	}

 	public void onMessage(Message message) {
 		try {
 			// receive log event in your consumer
 			LoggingEvent event = (LoggingEvent)((ActiveMQObjectMessage)message).getObject();
 			System.out.println("Received log [" + event.getLevel() + "]: "+ event.getMessage());
 		} catch (Exception e) {
 			e.printStackTrace();
 		}
 	}
 }
 </pre>
 </div></div>

 <p>Note that appender send logging event wrapped in an object message, so you can extract information such as logger name, level and of course the message.</p>

 <p>Starting with ActiveMQ 5.3, this example is included in the standard distribution. You can run it by executing</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 ant log4j-jms
 </pre>
 </div></div>

 <p>inside <code>example/</code> folder. You can expect the following output as a result:</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 log4j-jms:
      [echo] Running a Log4j JMS Appender example
      [java] 2009-08-11 13:58:46,767 INFO  Log4jJMSAppenderExample - Test log
      [java] Received log [INFO]: Test log
      [java] Java Result: 1
 </pre>
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	<div class="wiki-content maincontent"><p><a shape="rect" class="external-link" href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/net/JMSAppender.html">Log4j JMS appender</a> can be used to send your log messages to JMS broker. To use ActiveMQ as a destination of your messages, you need to configure JMS appender properly. The code sample below shows example configuration:</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	log4j.rootLogger=INFO, stdout, jms

	## Be sure that ActiveMQ messages are not logged to 'jms' appender
	log4j.logger.org.apache.activemq=INFO, stdout

	log4j.appender.stdout=org.apache.log4j.ConsoleAppender
	log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
	log4j.appender.stdout.layout.ConversionPattern=%d %-5p %c - %m%n

	## Configure 'jms' appender. You'll also need jndi.properties file in order to make it work
	log4j.appender.jms=org.apache.log4j.net.JMSAppender
	log4j.appender.jms.InitialContextFactoryName=org.apache.activemq.jndi.ActiveMQInitialContextFactory
	log4j.appender.jms.ProviderURL=tcp://localhost:61616
	log4j.appender.jms.TopicBindingName=logTopic
	log4j.appender.jms.TopicConnectionFactoryBindingName=ConnectionFactory
	</pre>
	</div></div>

	<p>The important thing is not to send ActiveMQ logs to JMS appender, as it can cause errors since the broker will want to log before the connection is established. You will also need a JNDI configuration, so that appender can find appropriate topic to send log messages to. The example <code>jndi.properties</code> file can look like this:</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	topic.logTopic=logTopic
	</pre>
	</div></div>

	<p>Finally, you can subscribe to the topic and listen for log messages:</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	public class Log4jJMSAppenderExample implements MessageListener {

	public Log4jJMSAppenderExample() throws Exception {
	// create a logTopic topic consumer
	ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
	Connection conn = factory.createConnection();
	Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
	conn.start();
	MessageConsumer consumer = sess.createConsumer(sess.createTopic("logTopic"));
	consumer.setMessageListener(this);
	// log a message
	Logger log = Logger.getLogger(Log4jJMSAppenderExample.class);
	log.info("Test log");
	// clean up
	Thread.sleep(1000);
	consumer.close();
	sess.close();
	conn.close();
	System.exit(1);
	}

	public static void main(String[] args) throws Exception {
	new Log4jJMSAppenderExample();
	}

	public void onMessage(Message message) {
	try {
	// receive log event in your consumer
	LoggingEvent event = (LoggingEvent)((ActiveMQObjectMessage)message).getObject();
	System.out.println("Received log [" + event.getLevel() + "]: "+ event.getMessage());
	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	}
	</pre>
	</div></div>

	<p>Note that appender send logging event wrapped in an object message, so you can extract information such as logger name, level and of course the message.</p>

	<p>Starting with ActiveMQ 5.3, this example is included in the standard distribution. You can run it by executing</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	ant log4j-jms
	</pre>
	</div></div>

	<p>inside <code>example/</code> folder. You can expect the following output as a result:</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	log4j-jms:
	[echo] Running a Log4j JMS Appender example
	[java] 2009-08-11 13:58:46,767 INFO Log4jJMSAppenderExample - Test log
	[java] Received log [INFO]: Test log
	[java] Java Result: 1
	</pre>
	</div></div></div>
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