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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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NP_CLOSING_NULL NP: close() invoked on a value that is always null (NP_CLOSING_NULL)

close() is being invoked on a value that is always null. If this statement is executed, a null pointer exception will occur. But the big risk here you never close something that should be closed.