Java debug/trace tool without source code

We bought some packages for enterprise Java Web application. These packages dosn't has source code. We met difficult in debug/trace of these package.

Is there some tool which can debug/trace Java program without source code? or the best tool to decompile class? We tried Dcafe, DJ, Jad, sourceagain. These decompilers doesn't support Jdk1.4/J2ee1.3.

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Go Google it. No expert would like to get into trouble by telling you about decompilers here.
Decompilers aren't always necessary.  If you're trying to track problems with those packages, a profiler will probably do what you need.

Try the Extensible Java Profiler:

or JProfiler

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