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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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MSF_MUTABLE_SERVLET_FIELD

MSF: Mutable servlet field (MSF_MUTABLE_SERVLET_FIELD)
A web server generally only creates one instance of servlet or jsp class (i.e., treats
the class as a Singleton),
and will
have multiple threads invoke methods on that instance to service multiple
simultaneous requests.
Thus, having a mutable instance field generally creates race conditions.