recursiveCause = new ExceptionWithCause(a);
cyclicCause = new ExceptionWithCause(a);
    public void setUp() {        withoutCause = createExceptionWithoutCause();        nested = new NestableException(withoutCause);        withCause = new ExceptionWithCause(nested);        jdkNoCause = new NullPointerException();        selfCause = new ExceptionWithCause(null);        selfCause.setCause(selfCause);        ExceptionWithCause a = new ExceptionWithCause(null);        ExceptionWithCause b = new ExceptionWithCause(a);        a.setCause(b);        recursiveCause = new ExceptionWithCause(a);    }