mpiJava implementation issues
Interfacing Java to MPI not always trivial, e.g., see low-level conflicts between the Java runtime and interrupts in MPI.
Situation improving as JDK matures - 1.2?
Now reliable on Solaris MPI (SunHPC, MPICH), shared memory, NT (WMPI).
Linux - Blackdown JDK 1.2 beta just out and seems OK - other ports in progress.