output: #fixed code
                                  @Test
      public void testConsumerStartWithInterval() {
          int msgSize = 100;
          String originMsgDCName = RandomUtils.getStringByUUID();
          String msgBodyDCName = RandomUtils.getStringByUUID();
  
          RMQNormalConsumer consumer1 = getConsumer(nsAddr, topic, tag,
              new RMQNormalListner(originMsgDCName, msgBodyDCName));
          producer.send(tag, msgSize, 100);
          TestUtils.waitForMoment(5);
          getConsumer(nsAddr, consumer1.getConsumerGroup(), tag,
              new RMQNormalListner(originMsgDCName, msgBodyDCName));
          TestUtils.waitForMoment(5);
  
          consumer1.getListner().waitForMessageConsume(producer.getAllMsgBody(), consumeTime);
          assertThat(VerifyUtils.getFilterdMessage(producer.getAllMsgBody(),
              consumer1.getListner().getAllMsgBody()))
              .containsExactlyElementsIn(producer.getAllMsgBody());
      }
input: #vulnerable code 
                                  @Test
      public void testConsumerStartWithInterval() {
          String tag = "jueyin";
          int msgSize = 100;
          String originMsgDCName = RandomUtils.getStringByUUID();
          String msgBodyDCName = RandomUtils.getStringByUUID();
  
          RMQNormalConsumer consumer1 = getConsumer(nsAddr, topic, tag,
              new RMQNormalListner(originMsgDCName, msgBodyDCName));
          producer.send(tag, msgSize, 100);
          TestUtils.waitForMoment(5);
          RMQNormalConsumer consumer2 = getConsumer(nsAddr, consumer1.getConsumerGroup(), tag,
              new RMQNormalListner(originMsgDCName, msgBodyDCName));
          TestUtils.waitForMoment(5);
  
          consumer1.getListner().waitForMessageConsume(producer.getAllMsgBody(), consumeTime);
          assertThat(VerifyUtils.getFilterdMessage(producer.getAllMsgBody(),
              consumer1.getListner().getAllMsgBody()))
              .containsExactlyElementsIn(producer.getAllMsgBody());
      } 
                              #location 16 
                              #vulnerability type NULL_DEREFERENCE