#fixed code
                                @Test
    public void testTwoConsumerWithSameGroup() {
        int msgSize = 20;
        String originMsgDCName = RandomUtils.getStringByUUID();
        String msgBodyDCName = RandomUtils.getStringByUUID();
        RMQNormalConsumer consumer1 = getConsumer(nsAddr, topic, tag,
            new RMQNormalListner(originMsgDCName, msgBodyDCName));
        getConsumer(nsAddr, consumer1.getConsumerGroup(), tag,
            new RMQNormalListner(originMsgDCName, msgBodyDCName));
        producer.send(tag, msgSize);
        Assert.assertEquals("Not all are sent", msgSize, producer.getAllUndupMsgBody().size());
        consumer1.getListner().waitForMessageConsume(producer.getAllMsgBody(), consumeTime);

        assertThat(VerifyUtils.getFilterdMessage(producer.getAllMsgBody(),
            consumer1.getListner().getAllMsgBody()))
            .containsExactlyElementsIn(producer.getAllMsgBody());
    }
#vulnerable code 
                                @Test
    public void testTwoConsumerWithSameGroup() {
        String tag = "jueyin";
        int msgSize = 20;
        String originMsgDCName = RandomUtils.getStringByUUID();
        String msgBodyDCName = RandomUtils.getStringByUUID();
        RMQNormalConsumer consumer1 = getConsumer(nsAddr, topic, tag,
            new RMQNormalListner(originMsgDCName, msgBodyDCName));
        RMQNormalConsumer consumer2 = getConsumer(nsAddr, consumer1.getConsumerGroup(), tag,
            new RMQNormalListner(originMsgDCName, msgBodyDCName));
        producer.send(tag, msgSize);
        Assert.assertEquals("Not all are sent", msgSize, producer.getAllUndupMsgBody().size());
        consumer1.getListner().waitForMessageConsume(producer.getAllMsgBody(), consumeTime);

        assertThat(VerifyUtils.getFilterdMessage(producer.getAllMsgBody(),
            consumer1.getListner().getAllMsgBody()))
            .containsExactlyElementsIn(producer.getAllMsgBody());
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE