ERROR Superclass javalangObject not found


I’m getting an error compiling java services in Developer:
**** ERROR
Superclass java.lang.Object of class MyPackage1.MyPackage2 not found.
public final class MyPackage2

The service namespace is MyPackage1.MyPackage2.myJavaService. The weird thing is I used to be able to compile successfully on this server and nothing changed whatsoever except for a few scheduled IS/Server restarts. I’m running IS 6.0.1 on AIX 5.1

Any help is appreciated.