Yes, it's a normal JDI connection. And it doesn't "just work", I'm afraid,
nor do I see why it might. I don't know how it works with JSPs. Do compiled
JSP classes contain a stratum with JSP line info? Nashorn script classes
only contain a Java stratum, as far as I can tell.

Regards,
Harald


2015-03-15 0:12 GMT+01:00 Max Rydahl Andersen <[email protected]>:

> 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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