output: #fixed code
                               @Test
  	public void testParseResult() {
  		List<ItemCollection> result=null;
  		String testString = "{\n" + 
  				"  \"responseHeader\":{\n" + 
  				"    \"status\":0,\n" + 
  				"    \"QTime\":4,\n" + 
  				"    \"params\":{\n" + 
  				"      \"q\":\"*:*\",\n" + 
  				"      \"_\":\"1567286252995\"}},\n" + 
  				"  \"response\":{\"numFound\":2,\"start\":0,\"docs\":[\n" + 
  				"      {\n" + 
  				"        \"type\":[\"model\"],\n" + 
  				"        \"id\":\"3a182d18-33d9-4951-8970-d9eaf9d337ff\",\n" + 
  				"        \"_modified\":[20190831211617],\n" + 
  				"        \"_created\":[20190831211617],\n" + 
  				"        \"_version_\":1643418672068296704},\n" + 
  				"      {\n" + 
  				"        \"type\":[\"adminp\"],\n" + 
  				"        \"id\":\"60825929-4d7d-4346-9333-afd7dbfca457\",\n" + 
  				"        \"_modified\":[20190831211618],\n" + 
  				"        \"_created\":[20190831211618],\n" + 
  				"        \"_version_\":1643418672172105728}]\n" + 
  				"  }}";
  		
  		
  		
  		result=solrSearchService.parseQueryResult(testString);
  		Assert.assertEquals(2,result.size());
  		
  		ItemCollection document=null;
  
  		document=result.get(0);
  		Assert.assertEquals("model", document.getItemValueString("type"));
  		Assert.assertEquals("3a182d18-33d9-4951-8970-d9eaf9d337ff", document.getItemValueString("id"));
  		Assert.assertEquals(1567278977000l, document.getItemValueDate("_modified").getTime());
  		Assert.assertEquals(1567278977000l, document.getItemValueDate("_created").getTime());
  		
  		document=result.get(1);
  		Assert.assertEquals("adminp", document.getItemValueString("type"));
  		Assert.assertEquals("60825929-4d7d-4346-9333-afd7dbfca457",document.getItemValueString("id"));
  		Assert.assertEquals(1567278978000l, document.getItemValueDate("_created").getTime());
  		
  	}
input: #vulnerable code 
                               @Test
  	public void testParseResult() {
  		List<ItemCollection> result=null;
  		String testString = "{\n" + 
  				"  \"responseHeader\":{\n" + 
  				"    \"status\":0,\n" + 
  				"    \"QTime\":4,\n" + 
  				"    \"params\":{\n" + 
  				"      \"q\":\"*:*\",\n" + 
  				"      \"_\":\"1567286252995\"}},\n" + 
  				"  \"response\":{\"numFound\":2,\"start\":0,\"docs\":[\n" + 
  				"      {\n" + 
  				"        \"type\":[\"model\"],\n" + 
  				"        \"id\":\"3a182d18-33d9-4951-8970-d9eaf9d337ff\",\n" + 
  				"        \"_modified\":[20190831211617],\n" + 
  				"        \"_created\":[20190831211617],\n" + 
  				"        \"_version_\":1643418672068296704},\n" + 
  				"      {\n" + 
  				"        \"type\":[\"adminp\"],\n" + 
  				"        \"id\":\"60825929-4d7d-4346-9333-afd7dbfca457\",\n" + 
  				"        \"_modified\":[20190831211618],\n" + 
  				"        \"_created\":[20190831211618],\n" + 
  				"        \"_version_\":1643418672172105728}]\n" + 
  				"  }}";
  		
  		
  		
  		result=solrSearchService.parseQueryResult(testString);
  		Assert.assertEquals(2,result.size());
  		
  		ItemCollection document=null;
  
  		document=result.get(0);
  		Assert.assertEquals("model", document.getItemValueString("type"));
  		Assert.assertEquals("3a182d18-33d9-4951-8970-d9eaf9d337ff", document.getUniqueID());
  		Assert.assertEquals(1567278977000l, document.getItemValueDate("$modified").getTime());
  		Assert.assertEquals(1567278977000l, document.getItemValueDate("$created").getTime());
  		
  		document=result.get(1);
  		Assert.assertEquals("adminp", document.getItemValueString("type"));
  		Assert.assertEquals("60825929-4d7d-4346-9333-afd7dbfca457", document.getUniqueID());
  		Assert.assertEquals(1567278978000l, document.getItemValueDate("$created").getTime());
  		
  	} 
                              #location 36 
                              #vulnerability type NULL_DEREFERENCE