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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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RC_REF_COMPARISON

RC: Suspicious reference comparison (RC_REF_COMPARISON)
 This method compares two reference values using the == or != operator,
where the correct way to compare instances of this type is generally
with the equals() method.
It is possible to create distinct instances that are equal but do not compare as == since
they are different objects.
Examples of classes which should generally
not be compared by reference are java.lang.Integer, java.lang.Float, etc.