“document” is not defined in java ScriptEng

Question

i'm trying to call document in java using scriptEngine here is my code

     ScriptEngineManager scriptEngineManager=new ScriptEngineManager();
     ScriptEngine scriptEngine=scriptEngineManager.getEngineByName("nashorn");
    scriptEngine.eval("function func(){" +
    "document.location.href=someUrl;" +
                  "var text=document.getElementsByTagName('textarea')[0];"}"
                    );
            Invocable invocable= (Invocable) scriptEngine;
            ((Invocable) scriptEngine).invokeFunction("func");

it throws an exception

javax.script.ScriptException: ReferenceError: "document" is not defined in <eval> at line number 1

Answer 1

The script engine in Java provides the ability to execute Javascript code, but does not provide an emulation of a browser.

document, window and other objects are defined by the browsers but are not mandated to be present by ECMAScript specification (http://www.ecma-international.org/ecma-262/5.1/#sec-15).