jython-users

[Jython-users] Creating a .class file from a .py file from inside a Java app

[Max M. <max...@ma...>]

Hi,
	I have actually just recently gotten into jython, very cool  
I must say.  I am right now in the process of writing a WebObjects  
framework that will allow for the use of Jython WOComponents.  When  
it is done I'll release the source and make an annoucement on this  
list.  Anyways, right now I have written a JythonClassLoader that  
when given the path to a .py file it will compile the file to a  
.class using jythonc and then read the .class in and construct the  
Class object. So what I am wondering is it possible to not use  
jythonc to compile the .class? I have been looking through the api in  
the compiler package, but I haven't been able to find that magic  
method.  What I would really like to be able to do is in my Java app  
read in the .py file and then using the Java api's of jython, compile  
the .py file into a byte array (optionally write out the .class at  
this point) then construct the Class object, never having to fire up  
a process outside the regular vm.  Anyone have any ideas?  Thanks in  
advance.

Regards,	
	Max

ps - One thing that I did think of that just doesn't seem very  
efficient is to use the Interpreter and read in the main.py of the  
jythonc and try to catch the output before it goes to disk. But that  
sounds like it would have more overhead than just running a process  
outside the current process.

Re: [Jython-users] Creating a .class file from a .py file from inside a Java app

[Robert W. B. <rb...@di...>]

Hello Max,

On Thu, 18 Oct 2001, Max Muller wrote:
> Hi,
> 	I have actually just recently gotten into jython, very cool
> I must say.  I am right now in the process of writing a WebObjects
> framework that will allow for the use of Jython WOComponents.  When
> it is done I'll release the source and make an annoucement on this
> list.  Anyways, right now I have written a JythonClassLoader that
> when given the path to a .py file it will compile the file to a
> .class using jythonc and then read the .class in and construct the
> Class object. So what I am wondering is it possible to not use
> jythonc to compile the .class? I have been looking through the api in
> the compiler package, but I haven't been able to find that magic
> method.  What I would really like to be able to do is in my Java app
> read in the .py file and then using the Java api's of jython, compile
> the .py file into a byte array (optionally write out the .class at
> this point) then construct the Class object, never having to fire up
> a process outside the regular vm.  Anyone have any ideas?  Thanks in
> advance.

An embedded interpreter sounds ideal for your situation, if I've
understood everything correctly. You could execute a .py file in the
embedded interpreter, then retrieve the class defined in that file as a
Java object with the interpreter's get method.  A good example of this is
the org.python.util.PyServlet class that comes with Jython.

More embedding info found at http://www.jython.org/docs/embedding.html

-robert