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Is JRuby compatibility to Ruby not very close?

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I am writing a fairly complex application in JRuby using Eclipse. The problem is that when running the code no errors are raised in the ruby code and no java exceptions for java code.

This is adding a significant amount of development time, time that I really don't have and time lost if I just used MRI.

In fact, writing JRuby with these issues is probably slower than if I just used Java, which is shocking to me.

Is there some magic trick in getting ruby and java to behave properly? If it matters, it is a swing based app.
pie sneak
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This is the first time I've heard of anyone having this problem. It should dump errors to the console. The support for JRuby on NetBeans is a bit better than Eclipse, so if you aren't married to Eclipse...
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