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java.lang.IllegalStateException: Logging factory implementation cannot be null. See also http://www.slf4j.org/codes.html#null_LF	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:86)	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:131)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:204)	at org.apache.activemq.ActiveMQPrefetchPolicy.(ActiveMQPrefetchPolicy.java:30)	at org.apache.activemq.ActiveMQConnectionFactory.(ActiveMQConnectionFactory.java:88)	at org.apache.activemq.ActiveMQConnectionFactory.(ActiveMQConnectionFactory.java:121)	at org.apache.activemq.ActiveMQConnectionFactory.(ActiveMQConnectionFactory.java:117)	at org.apache.activemq.jndi.ActiveMQInitialContextFactory.createConnectionFactory(ActiveMQInitialContextFactory.java:201)	at org.apache.activemq.jndi.ActiveMQInitialContextFactory.createConnectionFactory(ActiveMQInitialContextFactory.java:140)	at org.apache.activemq.jndi.ActiveMQInitialContextFactory.getInitialContext(ActiveMQInitialContextFactory.java:65)	at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)	at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)	at javax.naming.InitialContext.init(InitialContext.java:223)	at javax.naming.InitialContext.(InitialContext.java:197)	at ch.qos.logback.core.net.JMSAppenderBase.buildJNDIContext(JMSAppenderBase.java:49)	at ch.qos.logback.classic.net.JMSQueueAppender.start(JMSQueueAppender.java:89)	at ch.qos.logback.core.joran.action.AppenderAction.end(AppenderAction.java:89)	at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:310)	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:173)	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:154)	at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:48)	at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:336)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:96)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:74)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:38)	at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:23)	at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:34)	at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:43)	at org.slf4j.impl.StaticLoggerBinder.initialize(StaticLoggerBinder.java:62)	at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:53)	at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:48)	at org.slf4j.LoggerFactory.(LoggerFactory.java:60)	at foo.bar.testbed.LoggerTester.main(LoggerTester.java:9)