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Sonar-PMD is a plugin that provides coding rules from PMD.

There is a newer version: 4.0.3

An empty method in an abstract class should be abstract instead, as developer may rely on this empty implementation rather than code the appropriate one.
public abstract class ShouldBeAbstract
{
  public Object couldBeAbstract()
  {
  // Should be abstract method ?
    return null;
  }

  public void couldBeAbstract()
  {
  }
}