HI prince , i agree with you that there may be some class files missing at clientside. my doubt is i have my APPS sever and jms server running on same system...in that case i have used the following code to lookup Context context = new InitialContext(); QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) context.lookup("/ConnectionFactory"); then i did not got any exceptions... but when changed my lookup code to hst.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory"); hst.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces"); hst.put(Context.PROVIDER_URL,"jnp://localhost:1099"); Context context = new InitialContext(hst); QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) context.lookup("/ConnectionFactory"); i could not find much difference , in both cases i had my JMS,APPS server running on same system. if i am wrong with my statement, pls clarify it.. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989986#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...