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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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Sometimes expressions are wrapped in unnecessary parentheses, making them look like a function call. Example :
public class Foo {
  boolean bar() {
    return (true);
  }
}



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