New JRuby binding vs org.jruby.embed.localcontext.

问题:

I've issues with my ScriptExecutor, that's called by multiple threads. I don't want any interference between two scripts executing in two different threads (by interference I mean global variables at least)

@Service
public class ScriptExecutor
{
    private ScriptEngine engine;

    public ScriptExecutor() 
    {
            System.setProperty("org.jruby.embed.localcontext.scope", "threadsafe");
            engine = new ScriptEngineManager().getEngineByName("jruby");
            engine.getContext().setWriter(new OutputStreamWriter(...));
            engine.getContext().setErrorWriter(new OutputStreamWriter(...));
    }

    public Object executeScript(String path, Object args){
    {
         //... Load script from path
         engine.eval(r);
         return (Invocable) engine.invokeFunction("myFunction", args);
    }
}

Is this implementation thread safe ? By that I mean :

• do global jruby variables declared in each thread will be available only in the said thread (that's what I understand from this page)
• should I call eval(e, context) on a new context on every call of executeScript ? I was thinking about something like this solution
• Aren't those two solutions similar ?