I'm sure Google didn't bring back much. Most FEA that I know of is done in Fortran - MAYBE C, rarely C++. I'm not aware of any commercial code that uses Java.
Check here for s'ware:
http://dmoz.org/Science/Technology/Software_for_Engineering/Finite_Element_Analysis/
There are Java linear algebra packages. You can base your solvers on that stuff:
http://math.nist.gov/javanumerics/
But I think you'll be on your own with elements, inputs, etc.
Could be an interesting thing to do properly with interfaces, an XML input stream, etc.
Academic, work, or just interest?
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