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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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RV_EXCEPTION_NOT_THROWN

RV: Exception created and dropped rather than thrown (RV_EXCEPTION_NOT_THROWN)
 This code creates an exception (or error) object, but doesn't do anything with it. For example,
something like 

if (x < 0)
  new IllegalArgumentException("x must be nonnegative");


It was probably the intent of the programmer to throw the created exception:

if (x < 0)
  throw new IllegalArgumentException("x must be nonnegative");