JESP is a tool for statically examining the usage of user thrown exceptions in Java source code. Reported here are the first findings
over a dataset of 31 publicly available Java codes, including the JavaSpecs. Of greatest interest to compiler writers are
the findings that most Java exceptions are thrown across method boundaries, trys and catches occur in equal numbers, finallys
are rare, and programs fall into one of two categories, those dominated by throw statements and those dominated by catch statements.
The research reported here was supported, in part, by NSF grant CCR-9808607.