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Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

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BC_IMPOSSIBLE_CAST

BC: Impossible cast (BC_IMPOSSIBLE_CAST)

This cast will always throw a ClassCastException.
FindBugs tracks type information from instanceof checks,
and also uses more precise information about the types
of values returned from methods and loaded from fields.
Thus, it may have more precise information that just
the declared type of a variable, and can use this to determine
that a cast will always throw an exception at runtime.