FindClass Error!!! (very STRANGE)

I wrote a C program to invoke a java application. The program worked perfectly before. But when I try to run the program today, the env->FindClass function somehow does not work correctly. It can find java/slang/String. But it can not find classes in my own package (like soap.jar). The real STRANGE thing is it can find all the interfaces the package but not the real classes.

Did someone have the same experience? any clue would be highly appreciated!

[477 byte] By [yijianwu] at [2007-9-26 11:21:39]
# 1
Did you verify that the jar has the classes? Or the directory? Maybe it was cleaned?
jschell at 2007-7-2 0:29:08 > top of Java-index,Java HotSpot Virtual Machine,Specifications...