Cannot run - Error " "main" java.lang.NoClassDefFoundError: MainClass "

[pradeep reddy]

I am trying to configure JMXTERM to flush cache, when I copied the jar file to appropriate location and trying to RUN, I am seeing below Error.

Linux sj1slm276 2.6.18-308.24.1.el5 #1 SMP Wed Nov 21 11:42:14 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
[root@sj1slm276 lib]# pwd
/apps/java/32/jdk1.6.0_24/lib
[root@sj1slm276 lib]# java -jar jmxterm-1.0-alpha-4.jar
Exception in thread "main" java.lang.NoClassDefFoundError: MainClass
   at gnu.java.lang.MainThread.run(libgcj.so.7rh)
Caused by: java.lang.ClassNotFoundException: MainClass not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:jmxterm-1.0-alpha-4.jar], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at java.net.URLClassLoader.findClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at gnu.java.lang.MainThread.run(libgcj.so.7rh)