Re: [wtp-dev] Nashorn Debugging

["Max Rydahl Andersen" <manderse@xxxxxxxxxx>]

Okey, so I reached out to netbeans guys and he confirmed to me it is 
really underdocumented, but
apparently the DebuggerSupport class is part of the key and the only 
known public documentation for it
is in this example: https://github.com/wickund/nashornexamples

this is showing how a debugger can connect to nashorn over the debug 
protocol.

Interested in picking up that challenge ?

/max

> On 15 Mar 2015, at 9:27, Harald Wellmann wrote:
>
> > 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?
>
> Yes, the sourcelocation info on class'es would have a 
> filename:linenumber piece of info.
>
> > Nashorn script classes
> > only contain a Java stratum, as far as I can tell.
>
> Yeah, I tried googling and apparently nashorn doesn't fit as smooth as 
> rhino did.
>
> I'm still looking and will ask around but I did find this jira: 
> https://bugs.openjdk.java.net/browse/JDK-8044798
> which talks about jdk.nashorn.internal.runtime.DebuggerSupport  being 
> what is supposed to be used
> for external debuggers.
>
> I think thats what netbeans/intellij uses - but i'm not sure.
>
> /max
>
>
> > Regards,
> > Harald
> >
> >
> > 2015-03-15 0:12 GMT+01:00 Max Rydahl Andersen <manderse@xxxxxxxxxx>:
> >
> > > 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 <hwellmann.de@xxxxxxxxx>
> > > 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
> > > > _______________________________________________
> > > > wtp-dev mailing list
> > > > wtp-dev@xxxxxxxxxxx
> > > > To change your delivery options, retrieve your password, or 
> > > > unsubscribe
> > > from this list, visit
> > > > https://dev.eclipse.org/mailman/listinfo/wtp-dev
> > > _______________________________________________
> > > wtp-dev mailing list
> > > wtp-dev@xxxxxxxxxxx
> > > To change your delivery options, retrieve your password, or 
> > > unsubscribe
> > > from this list, visit
> > > https://dev.eclipse.org/mailman/listinfo/wtp-dev
> > _______________________________________________
> > wtp-dev mailing list
> > wtp-dev@xxxxxxxxxxx
> > To change your delivery options, retrieve your password, or 
> > unsubscribe from this list, visit
> > https://dev.eclipse.org/mailman/listinfo/wtp-dev
>
>
> /max
> http://about.me/maxandersen


/max
http://about.me/maxandersen