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Not for a company, just for my own testing, but I did this several years back.

It was ridiculously easy assuming you know how a java decompiler works. One JAR needed to be patched and re-compiled, which is a trivial process if you know how classpaths work.

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You don't even need to patch any files - you can patch classes at runtime using a "-javaagent" library.

There are plenty of libraries out there to facilitate this such as Javassist or Apache BCEL, and lots of legitimate uses (AOP, instrumentation, etc).

It'd be weird to have access to the command line but not to the jars themselves, I think. Creating a jar is simple if you have a zip program.

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