Problem using non HP Java files

[Vadim Landa]

I am writing Java application for HP_UX 10.20. I have to use third party class files which were compiled with non HP Java compiler. When I try to compile my java files that use third party class files, I get compilation errors like this:
Class SSI_WM_Connection not found in type declaration.
although third party class files are in the same directory as my java files. So, I think the problem is that HP Java compiler does not recognize the format. I don't blame my code because NT version of the same application works fine. Is there any way to make compiled Java files HP compatible other than recompiling source code with HP Java compiler?

Thanks