Trouble understanding JsInterop

If I have a java class and I mark it with @JsType I create a contract between Java and Javascript that I can use this class with it's given Java name in Javascript - is this correct?

package com.test.workertest.shared;


import com.google.gwt.core.shared.GWT;


import jsinterop.annotations.*;


@JsType(namespace = "test", name = "JsOpClass")
public class JsOpClass
{


    @JsMethod
    public void printStuff()
    {
        GWT.log("asdfasdf");
    }
}

I would like to be able to create now a JsOpClass object in javascript and call printStuff() on this object but I actually don't understand where this is meant to be working. If I create for example a web worker which would create this class it reports that 

com.google.gwt.event.shared.UmbrellaException: Exception caught: (ReferenceError) : testis not defined

which makes sense because my worker.js knows nothing about GWT (would this be possible?)

And even if I try it in the GWT HTML file it doesn't seem to know about this class and I get a test is not defined error.

How do I actually call exposed classes/methods and from where is it possible? Is it only a JSNI substitute (but even then I was not able to call it from a JSNI method).

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