java使用js engine报错空指针

跟本站的其他几个博客中写的差不多但一直报错

public class Test {
    public static void main(String[] args) throws ScriptException {
            ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine engine = manager.getEngineByName("js");
            String str = "\'u5236\'";
            String result = (String) engine.eval(str);
            System.out.println(result);
        }

    }

这边是报错

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "javax.script.ScriptEngine.eval(String)" because "engine" is null
    at Test.main(Test.java:10)

望大佬指教

结题，jdk1.5可能是不支持js，换成1.8就不再报错了