hi I am getting the following error while using jms. javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.lang.ClassNotFoundException: org.jbossmq.referenceable.ObjectRefAddr (no security manager: RMI class loader disabled)] I am not using embeded tomcat and i am starting the two servers separately. i have read the solution given by u in the mailing list and tried to include the jbossmq.jar and jbossmq-client.jar in the classpath so that the above exception may be avoided. The main problem i am facing for the past two days is that even if i try to add a single jar file to may tomcats classpath it behaves in an unusal manner and i am not even able to login in to my application and i get security association exception error. I tried number of ways to add jar files to my classpath but tomcat gives me the above error in which ever way i try to add the jar files to classpath.if we remove the jar files from the classpath then i would be able to login in to my application(my application consists of 25 beans and nearly 80 jsps).I will get the above secuity error when i tried to add any jar file to my classpath. Is there any special way to set the classpath in tomcat? I even tried to add the jar files to my autoexec.bat and restarted my machine so that tomcat can recognise the jar files but still i get the security error and once i remove the jar files from the autoexec.bat and restart my machine it is working fine. I am unable to solve this problem for the past two days .i am trying hundreds of ways to set classpath to tomcat but i am failing in each occasssion.please help me in this matter. Thank's ---Venkat Ammisetty _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user