Hi! When i try to use a jems installer version 1.2.0.GA on RH 4 update 4 ES with JDK 1.4.2._19 installed i got a error as show below: [root@localhost tmp]# java -jar jems-installer-1.2.0.GA.jar Warning: -jar not understood. Ignoring. Exception in thread "main" java.lang.NoClassDefFoundError: jems-installer-1.2.0.GA.jar at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0) at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0) at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0) at __gcj_personality_v0 (/tmp/java.version=1.4.2) at __libc_start_main (/lib/tls/libc-2.3.4.so) at _Jv_RegisterClasses (/tmp/java.version=1.4.2) Can someone tell me what does it means and how to solve it? Regards Marcin View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4195287#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...