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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.

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The NPath complexity of a method is the number of acyclic execution paths through that method. A threshold of 200 is generally considered the point where measures should be taken to reduce complexity. Example :
public class Foo {
  void bar() {
   // lots of complicated code
  }
 }