output: #fixed code
                                  public void testAtomicInt() throws Exception
      {
          AtomicInteger value = MAPPER.readValue("13", AtomicInteger.class);
          assertEquals(13, value.get());
      }
input: #vulnerable code 
                                  public void testAtomicInt() throws Exception
      {
          ObjectMapper mapper = new ObjectMapper();
          AtomicInteger value = mapper.readValue("13", AtomicInteger.class);
          assertEquals(13, value.get());
      } 
                              #location 5 
                              #vulnerability type NULL_DEREFERENCE