Re: [Jython-users] Using Jython as an interactive Java debugger.

[John D. H. <jh...@is...>]

Hi all,

This is really old JPython code that I started when I was doing a lot of =
Java=20
coding (~2 years ago).  But it might be useful to people.

Attached is a JPython module that is supposed to wrap the JDI debugger=20
libraries.  I used to run it interactively in JPython and interatively de=
bug=20
Java programs.

Note:  I apparently am missing a Helper module that used to go along with=
=20
this, but I don't think it was terribly important.  It does mean that thi=
s=20
code won't run currently at all though.

I hope this is useful to someone.

John


On Friday 20 July 2001 03:02, Paul Giotta wrote:
> I am currently have a side project that will do something like this. It
> is a module that implements a telnet daemon that runs as a java thread.
> When someone connects, it starts a jython interpreter and uses this as
> the shell for user interaction. Thus, if this is embedded in a running
> server, you can connect using an ordinary telnet client and manipulate
> object running in the same VM. This is still work in progress, but some
> of the sticky points so far:
>
>    - Implementing telnet: I tried to find a java telnet daemon that I
> could adapt or borrow code from. There does not seem to be any yet. Als=
o
> getting complete and understandable documentation for the telnet protoc=
ol
> is not that easy (every time I use a new telnet client, it starts tryin=
g
> to negotiate some other connection parameter that i cannot find in any
> documentation).
>
>    - There has to be a way to get references to the other objects that
> you want to manipulate. This can be as simple as placing references to
> all of the objects that you want to manipulate into a hashtable that is
> statically initialized or available through a singleton. It just need t=
o
> be done in advance, otherwise the jython interpreter winds up more or
> less isolated from the rest of the application.
>
>    - If I try to run multiple instances of jython interpreters in
> different threads, bad things start to happen. It is not really critica=
l
> that I handle multiple connections simultaneously, but I would not expe=
ct
> this to be a problem. :-(
>
>
> AFAIK it is also possible to remotely connect to a running VM using the
> Java debugging API (if the VM was started with debugging options on), s=
o
> if you go this route, you do not need to provide your own interpreter i=
n
> that VM, but jython might be helpful in making a simple client.
>
> The idea of the project above is to do more high level interaction, lik=
e
> reconfiguration, at runtime.
>
> -Paul
>
> > I am experimenting with Jython at the moment. I am impressed.
> >
> > I was wondering if any jython-guru's have used it to debug Java code.
> >
> > I guess you could run the Jython interpretor in a seperate thread to =
the
> > program you're trying to debug. You could then stop the thread from
>
> jython
>
> > and inspect the state of its attributes and test calling some of the
> > methods.
> >
> > This would be very handy for experimenting with swing gui's.
> >
> > Has anybody experimented with some of the Java debugger api's? It may
>
> even
>
> > be possible to set break points on particular methods.
> >
> > Any Ideas would be appreciated.
> >
> > Thanks,
> > Greg.
>
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John D. Heintz | Senior Engineer

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