JWS Application to Browser (JavaScript) communication

Here is my scenario:
I would like to use Java Web Start technology to distribute a training simulation application. The main application is written in native code, and I would like to launch the app from a web browser, and have the native app send simple messages back to the browser (i.e. "Objective xyz completed").
So far I've been able to create a Java Web Start wrapper application and deploy it along with the native code and resources via Java Web Start. So far so good. I also have tackled JNI to enable the native app to talk to the JWS wrapper.
My problem is getting the Java app (started via JWS) to talk back to the browser (specifically a JavaScript method or headless Java applet). Do my dismay, I have found that there is no direct way for JWS app to talk to the browser that launched it. So what are my "indirect" options?
I have been toying with the following ideas:
1) use a java applet in the browser to talk with the JWS app via sockets
2) use a java applet in the browser to talk with the JWS app via RMI
Is my analysis correct, or are there any other possible solutions to my problem?
Note that I am already using native code in the JWS app, so I will have to have some sort of elevated permissions anyway...
Thanks,
Chris

Sorry, but one of the main differences between an Applet and a JNLP app is that JNLP apps don't know anything about the browser. (The browser only knows about the JNLP MIME-type, which is (hopefully) associated with JavaWS.)
Basically, think of the JNLP app as any other stand-alone app when it comes to the browser. If you need to talk to the browser, then anything that would let a stand-alone app talk to the browser will also work for a JNLP app. However, I don't know of any standard tactic for doing this.
One question is, do you really need to talk to the browser, or is it possible you just want to talk to your server using HTTP?
Also, if all you want the browser to do is display a specific page, then there is an API for that in 5.0. This is described here:
http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/examples.html#BasicService
If you really need to talk to the browser, then you should probably consider writing your application as an applet instead.
Mike.

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TechNet Community Support
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]
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Edited by: blue72TA on Aug 16, 2011 11:41 AM
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