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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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JUnit assertions should include a message - i.e., use the three argument version of assertEquals(), not the two argument version.
public class Foo extends TestCase {
  public void testSomething() {
    assertEquals("foo", "bar"); // violation, should be assertEquals("Foo does not equals bar", "foo", "bar");
  }
}