Reinstall java on tiger

hello
I have been using a java based project management app called Project Management Desktop by Intellisys. It was a good app and then stopped launching.
Intellisys' tech support's take on it was that my copy of java was bad and that I needed to reinstal java.
Is that possible on a mac? (tiger dual g5)
is there any tests I can do to see if java is still running properly? the only one i found online was one for panther (in terminal typing "java -version" which for me returns "Bus error".
so are there other tests to check if my tiger java works and if it doesn't work can it be reinstalled with out reinstalling my whole system?
thanks

You can reinstall Java. First you need to remove any Java related .pkg receipts from the /Library/Receipts/ folder. You might also review this article relating to a Java problem in Panther: http://docs.info.apple.com/article.html?artnum=301382.
If you have to reinstall the entire Java system, then I believe the only proper method is to do an Archive and Install and reinstall Tiger from scratch. Be sure to boot from your Tiger DVD and run Disk Utilities to repair the hard drive prior to doing the Archive and Install.

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