#vulnerable code 
                                public void testAtomicBoolean() throws Exception
    {
        ObjectMapper mapper = new ObjectMapper();
        AtomicBoolean b = mapper.readValue("true", AtomicBoolean.class);
        assertTrue(b.get());
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void testAtomicBoolean() throws Exception
    {
        AtomicBoolean b = MAPPER.readValue("true", AtomicBoolean.class);
        assertTrue(b.get());
    }