problem in rmic(RMI)

polobo

hi all

when i use rmic to create the stub class, i got this exception:

java.lang.NullPointerException
   at 0x40268de4: java.lang.Throwable.Throwable() (/usr/lib/./libgcj.so.3)
   at 0x4025bcaf: java.lang.Exception.Exception() (/usr/lib/./libgcj.so.3)
   at 0x4025f56f: java.lang.RuntimeException.RuntimeException() (/usr/lib/./libgcj.so.3)
   at 0x4025ec67: java.lang.NullPointerException.NullPointerException() (/usr/lib/./libgcj.so.3)
   at 0x4021b627: _Jv_ThrowNullPointerException (/usr/lib/./libgcj.so.3)
   at 0x403202cb: ?? (??:0)
   at 0x4031c817: gnu.java.rmi.rmic.RMIC.generateStub() (/usr/lib/./libgcj.so.3)
   at 0x4031b6ed: gnu.java.rmi.rmic.RMIC.processClass(java.lang.String) (/usr/lib/./libgcj.so.3)
   at 0x4031b644: gnu.java.rmi.rmic.RMIC.run() (/usr/lib/./libgcj.so.3)
   at 0x4031b507: gnu.java.rmi.rmic.RMIC.main(java.lang.String[]) (/usr/lib/./libgcj.so.3)
   at 0x40242dd8: gnu.gcj.runtime.FirstThread.call_main() (/usr/lib/./libgcj.so.3)
   at 0x402ad02d: gnu.gcj.runtime.FirstThread.run() (/usr/lib/./libgcj.so.3)
   at 0x4024fc4c: _Jv_ThreadRun(java.lang.Thread) (/usr/lib/./libgcj.so.3)
   at 0x4021c8ac: _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/./libgcj.so.3)
   at 0x4021c9cd: JvRunMain (/usr/lib/./libgcj.so.3)
   at 0x080485a8: ?? (??:0)
   at 0x42015574: __libc_start_main (/lib/tls/libc.so.6)
   at 0x080484f5: ?? (??:0)

anybody can tell me why?moreover, how to handel this exception?

cheers