Re: [Jython-users] Multiple PythonInterpreter objects

[Juan P. C. <jpc...@ya...>]

Thanks a lot for your response. What do you mean with ' load entirely a new set of jython classes? To load it with a different classloader for every execution?
 Thanks,
           Juan Pablo

Leo User <leo...@ya...> escribió: If I remember right, when I developed the JythonShell
for jyleo I had this problem where a new shell started
up would be able to reference the running jython
instance which is not what I wanted.  What I did was
load an entirely new set of Jython classes per unique
instance I wanted.  That gave me the separation I
wanted.  Im not sure if loading a unique Jython per
invocation is a good idea for you, it seems far more
expensive than just synchronizing the darn thing.

leouser

--- Juan Pablo Carlino  wrote:

> Hi,
> 
> I'm having a strange problem with jython from long
> time ago. The error happens randomly and smells like
> jython internal race condition, but I'm not sure.
> I have read a post, in this mailing list which
> explains exactly the same problem I had during this
> time. The link is
>
http://sourceforge.net/mailarchive/message.php?msg_id=10134445
> Saddly for me, the issue appears to continue open.
> 
> My application is a multi-threading workflow engine
> written in java which invokes jython scripts to
> evaluate conditions and to execute actions in the 
> context of workflow instances.
> This application is really big, and actually manages
> a large volume of data, which impacts in the number
> of threads involved during normal usage.
> Every time a script must be evaluated, a new
> PythonInterpreter is built (by the way, I've tried
> two initialization styles: new PythonInterpreter()
> and also new PythonInterpreter(null, new new
> PySystemState()) )
> I have made a lot of tests, and when a big number of
> threads are executing scripts, sometimes, an
> execution crashes, with strange exception messages
> (things like mentioned in the previous link).
> If I synchronize statically the block of code where
> jython scripts are executed (in other words, I
> guaratee that only one script at a time can be
> executed) the problem disappears.
> Obviously, I have inspected my own java code to be
> sure that no race conditions exist during pre or
> post processing of jython invocation.
> So... any ideas?
> Thanks in advance,
> 
>             Juan Pablo
> 
> PS: I'm using jython Release_2_2alpha1
> 
>    
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---------------------------------
 Preguntá. Respondé. Descubrí.
 Todo lo que querías saber, y lo que ni imaginabas,
 está en Yahoo! Respuestas (Beta).
 Probalo ya!