Confused. Are you saying it works for you? Because it definitely doesn’t work for me. Sorry for the confusion, but the error isn’t on compilation. You actually have to run some code. E.g. something really simple like this (or any of the existing tests):

public class PetEntityTests {

@Test
public void test() throws Exception {
    new Pet();
}

}

It will fail with the verify error (unless you explicily switch off bytecode verification in your JVM).