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Unlike the standard C and Fortran interfaces, the mpiJava interfaces to MPI
calls do not return explicit error codes. The Java exception
mechanism will be used to report errors.
The exception mechanism is very widely
used by Java libraries. It is inconvenient to use up the single
return value of a Java function with an error code. (Java doesn't allow
function arguments to be passed by reference, so returning multiple
values tends to be more clumsy than in other languages.)