The JMS Client logging is handled using the Simple Logging Facade for Java (SLF4J). As the name implies, slf4j is a facade that delegates to other logging systems like log4j or JDK 1.4 logging. For more information on how to configure slf4j for specific logging systems, please consult the slf4j documentation.

When using the log4j binding, please set the log level for org.apache.qpid explicitly. Otherwise log4j will default to DEBUG which will degrade performance considerably due to excessive logging. The recommended logging level for production is WARN.

The following example shows the logging properties used to configure client logging for slf4j using the log4j binding. These properties can be placed in a log4j.properties file and placed in the CLASSPATH, or they can be set explicitly using the -Dlog4j.configuration property.

	log4j.logger.org.apache.qpid=WARN, console
	log4j.additivity.org.apache.qpid=false

	log4j.appender.console=org.apache.log4j.ConsoleAppender
	log4j.appender.console.Threshold=all
	log4j.appender.console.layout=org.apache.log4j.PatternLayout
	log4j.appender.console.layout.ConversionPattern=%t %d %p [%c{4}] %m%n