#fixed code
                                public void index() {




        renderText("hello " + serviceTest.getName("aaa"));




    }
#vulnerable code 
                                public void index() {



        List<Record> records = Db.find("select * from `user`");

        System.out.println("index .... ");

        LogKit.error("xxxxxxx");

        Jboot.getCache().put("test","test","valueeeeeeeeee");
        String value = Jboot.getCache().get("test","test");

        System.out.println("value:"+value);


        renderText("hello " + serviceTest.getName());

//        render();




    } 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE