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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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Avoid negation in an assertTrue or assertFalse test. For example, rephrase: assertTrue(!expr); as: assertFalse(expr);
public class SimpleTest extends TestCase {
  public void testX() {
    assertTrue("not empty", !r.isEmpty()); // violation, replace with assertFalse("not empty", r.isEmpty())
    assertFalse(!r.isEmpty()); // violation, replace with assertTrue("empty", r.isEmpty())
  }
}