#vulnerable code 
                                public void testBytestoCharArray() throws Exception
    {
        byte[] input = new byte[] { 1, 2, 3, 4, 5, 6, 7 };
        // first, do baseline encoding
        char[] expEncoded = mapper.convertValue(input, String.class).toCharArray();
        // then compare
        char[] actEncoded = mapper.convertValue(input, char[].class);
        assertArrayEquals(expEncoded, actEncoded);
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void testBytestoCharArray() throws Exception
    {
        byte[] input = new byte[] { 1, 2, 3, 4, 5, 6, 7 };
        // first, do baseline encoding
        char[] expEncoded = MAPPER.convertValue(input, String.class).toCharArray();
        // then compare
        char[] actEncoded = MAPPER.convertValue(input, char[].class);
        assertArrayEquals(expEncoded, actEncoded);
    }