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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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ME_MUTABLE_ENUM_FIELD

ME: Enum field is public and mutable (ME_MUTABLE_ENUM_FIELD)
A mutable public field is defined inside a public enum, thus can be changed by malicious code or by accident from another package.
  Though mutable enum fields may be used for lazy initialization, it's a bad practice to expose them to the outer world.
  Consider declaring this field final and/or package-private.