Stuck for 2 days: Exception in thread "main" java.lang.NoClassDefFoundError

Question

I wrote the code in netbeans 5.5 under windows XP and compiled perfectly. I tried to run the generated Jar file code in the command prompt and it did work perfectly.
C:\Datahub\dist> java -jar Datahub.jar
BUT when I took the jar file and tried to run it under linux here is what I got:
Exception in thread "main" java.lang.NoClassDefFoundError: while resolving class: main.hw
at java.lang.VMClassLoader.transformException(java.lang.Class, java.lang.Throwable) (/usr/lib/libgcj.so.6.0.0)
at java.lang.VMClassLoader.resolveClass(java.lang.Class) (/usr/lib/libgcj.so.6.0.0)
at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.6.0.0)
at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib/libgcj.so.6.0.0)
at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0)
Caused by: java.lang.ClassNotFoundException: java.lang.StringBuilder not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:Datahub.jar,file:./], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
at java.net.URLClassLoader.findClass(java.lang.String) (/usr/lib/libgcj.so.6.0.0)
at java.lang.ClassLoader.loadClass(java.lang.String, boolean) (/usr/lib/libgcj.so.6.0.0)
at java.lang.ClassLoader.loadClass(java.lang.String) (/usr/lib/libgcj.so.6.0.0)
at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib/libgcj.so.6.0.0)
...4 more
The project i am working on is funded by IBM and they will be really mad if it didn't work :(
Please help.

Answer 1

It is not clear what You want to run under Linux. Jar under JVM or native code? If You are going to use JVM make it clear for Yourself which one You are going to use and then make sure it is installed properly.