output: #fixed code
                                  public void testResponseContentNoEntity() throws Exception {
          HttpContext context = new BasicHttpContext(null);
          HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_OK, "OK");
          ResponseContent interceptor = new ResponseContent();
          interceptor.process(response, context);
          Header header = response.getFirstHeader(HTTP.CONTENT_LEN);
          assertNotNull(header);
          assertEquals("0", header.getValue());
      }
input: #vulnerable code 
                                  public void testResponseContentNoEntity() throws Exception {
          HttpContext context = new HttpExecutionContext(null);
          HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_OK, "OK");
          ResponseContent interceptor = new ResponseContent();
          interceptor.process(response, context);
          Header header = response.getFirstHeader(HTTP.CONTENT_LEN);
          assertNotNull(header);
          assertEquals("0", header.getValue());
      } 
                              #location 8 
                              #vulnerability type NULL_DEREFERENCE