OgnlOps#isEqual comparison of two enum thrown IllegalArgumentException about ognl HOT 2 CLOSED

public class EnumTest {

  enum Op {
    NE("<>") {}, // getClass() is "Op$1"
    EQ("=") {} // getClass() is "Op$2"
    ;

    Op(String s) {
    }
  }

  @Test
  public void testEnumCompare() throws OgnlException {
    assertThat(Op.NE.getClass().isAssignableFrom(Op.EQ.getClass()), is(false));
    assertThat(OgnlOps.isEqual(Op.NE, Op.EQ), is(false));
  }

}