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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

There is a newer version: 2.4

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Object clone() should be implemented with super.clone(). Example :
  class Foo{
    public Object clone(){
        return new Foo(); // This is bad
    }
}
  


This rule is deprecated, use {rule:squid:S1182} instead.