Is the connection made over normal jVm debugging ? Then my guess is that it 
should "just work". Like with when debugging java with jsps. 

But otherwise it might be necessary to have both debuggers connected ?

/max
http://about.me/maxandersen


> On 14 Mar 2015, at 19:24, Harald Wellmann <[email protected]> wrote:
> 
> Continuing a conversation [1] started in the JBoss Tools Forum, I would like 
> to discuss what it would take to support mixed JavaScript/Java debugging on 
> Nashorn with JSDT.
> 
> This is a feature that works very smoothly in NetBeans, but is not currently 
> supported by official Eclipse projects or any third-party plugins, as it 
> seems.
> 
> Scenario:
> 
> We are debugging a plain old Java application which embeds Nashorn via 
> javax.script.ScriptEngine and loads some JavaScript files. Some of the 
> JavaScript functions call Java methods via Nashorn extensions.
> 
> Using the Eclipse debugger, we can set breakpoints both in JavaScript and 
> Java sources and step through our application, from Java into JavaScript and 
> back into Java, with the appropriate source lines being highlighted in the 
> editor.
> 
> In the call stack, we can see Java and JavaScript stack frames embodied by 
> method calls of generated Java classes. When selecting a stack frame 
> corresponding to a JavaScript call, the variable inspector automatically 
> switches from Java to JavaScript mode, so we can inspect JavaScript objects.
> 
> 
> 
> So far, I've experimented with JDI and 
> jdk.nashorn.internal.runtime.DebuggerSupport and I sort of understand how to 
> track scripts being loaded and how to map breakpoints to JavaScript source 
> lines and vice versa.
> 
> I've taken a look at JSDT and JDT sources, and I'm not quite sure how this 
> mixed source scenario would fit into the existing approaches.
> 
> Implementing a new JSDI adapter for Nashorn along the lines of the Rhino 
> debugger would only cover the JavaScript part.
> 
> Would it be possible to start with a JDT debug launcher and extend it or 
> create some kind of mixin to switch between the Nashorn/Java and JavaScript 
> aspects of the same application?
> 
> Are there any solutions for other JVM languages supporting mixed-language 
> applications that might serve as an example?
> 
> [1] https://developer.jboss.org/message/920239
> 
> Best regards,
> Harald
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