java scripting API - how to stop the evaluation

Question

i have writen a servlet that recives a java script code and process it and returns the answer. for that i have used the java scripting API

in the code below if scrip

Answer 1

I know this is an older thread, but I have a more direct solution for stopping the JavaScript eval: Invoke the "exit" function that Nashorn provides.

Inside the class I use to run the script engine, I include:

private Invocable invocable_ = null;
private final ExecutorService pool_ = Executors.newFixedThreadPool(1);  

public boolean runScript(String fileName)
    {
    pool_.submit(new Callable() 
        {       
        ScriptEngine engine 
            = new ScriptEngineManager().getEngineByName("nashorn");
        public Boolean call() throws Exception
            {
            try
                {
                invocable_ = (Invocable)engine;
                engine.eval(
                        new InputStreamReader(
                                new FileInputStream(fileName), 
                                Charset.forName("UTF-8")) );
                return true;
                }
            catch (ScriptException ex)
                {
                ...
                return false;
                } 
            catch (FileNotFoundException ex)
                {
                ...
                return false;
                }                   
            }
        });

    return true;
    }

public void
shutdownNow()
    {

    try
        {
        invocable_.invokeFunction("exit");
        } 
    catch (ScriptException ex)
        {
        ...
        } 
    catch (NoSuchMethodException ex)
        {
        ...
        }

    pool_.shutdownNow();
    invocable_ = null;
    }

Now, call:

myAwesomeClass.shutdownNow();

The script will stop immediately.