chithu21 [https://community.jboss.org/people/chithu21] created the discussion "java.lang.NoClassDefFoundError: org/jboss/logging/Logger" To view the discussion, visit: https://community.jboss.org/message/740669#740669 -------------------------------------------------------------- I have a strange problem. I have a JMS client application & an `MDB` configured in Jboss jboss-5.1.0.GA. Earlier i added the jar by "Configure Build Path" --> "Add External jars" and everything was working fine. Now, I moved all the jars to a lib folder under my project and used "Configure Build Path" --> "Add jars". Now I get the following exception while executing the client program. :(     `Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/logging/Logger     at org.jnp.interfaces.NamingContext.<clinit>(NamingContext.java:160)     at org.jnp.interfaces.NamingContextFactory.getInitialContext(NamingContextFactory.java:56)     at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)     at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)     at javax.naming.InitialContext.init(Unknown Source)     at javax.naming.InitialContext.<init>(Unknown Source)     at com.dcat2.messaging.sendreceive.MessageReceiver_test.sendMessage(MessageReceiver_test.java:68)     at com.dcat2.messaging.sendreceive.MessageReceiver_test.main(MessageReceiver_test.java:57) Caused by: java.lang.ClassNotFoundException: org.jboss.logging.Logger     at java.net.URLClassLoader$1.run(Unknown Source)     at java.security.AccessController.doPrivileged(Native Method)     at java.net.URLClassLoader.findClass(Unknown Source)     at java.lang.ClassLoader.loadClass(Unknown Source)     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)     at java.lang.ClassLoader.loadClass(Unknown Source)     ... 8 more' I have jndi.properties in the classpath and the following jars. `jbossall-client.jar commons-logging.jar concurrent.jar javax.ejb.jar jms.jar jnp-client-4.2.2.GA.jar log4j-1.2.16.jar sqljdbc4.jar` Can anyone help please....? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/740669#740669] Start a new discussion in JBoss Messaging at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]