JEP and JPype in a single process

[Steve Menard]

skn wrote:
> Hello,
> 
> I have written a very simple java class file, which invokes a Python script
> using JEP.
> 
> Code snippet:-
> -------------------
> Jep jep = new Jep(false);
> jep.runScript("C:\\temp\\testscript.py");
> jep.close();
> 
> Now inside this Python script I want to make Java calls using JPype.
> If I use startjvm() inside this Python script, a Runtime Error (exception)
> is thrown.
> Also tried attachThreadToJVM(), but doesn't work, again Runtime Error.
> 
> Any clues as to how I could achieve my goal??
> The interaction shown below should happen in a single process.
> 
> JAVA ==> jep ==> PYTHON ==> jpype ==> JAVA
> 
> Regards,
> skn
> 
> 

You're trying to do something I hope to make possible somewhere down the 
road ...

As of today, I do not think it is possible. JPype does not provide a way 
to initialize the JVM-bridge system except for startJvm .. which seems 
to be prohibited when a JVM is already running.

AttachThreadToJVM will only work once the JVM-bridge system has been 
initialize.

I will look into providing a sister method to startJVM to attach to the 
currently running JVM instead of starting a new one. IF it does not 
require major changes I will release it as 0.5.1. If you'd like you can 
submit an enhancement request on the JPype sourceforge page, so this 
doesn't get lost.



-- 
Steve Menard
--------------------
Maintainer of http://jpype.sourceforge.net