Re: [Jython-users] java->python problems

[<bc...@wo...>]

[dman]

>I'm trying to use Jython(c) to allow using Moshe Zadka's PMS framework
>along with a Java/Swing GUI for a school project.  (The other group
>members are writing the gui and they don't know python)  I've run into
>a couple of problems, though, all related to java's type system.
>
>There are several modules in the PMS package.  I have taken the base
>classes of the inheritance tree and made them inherit from
>java.lang.Object and added the @sig lines.  A simplified example :
>
>----- PMS/AbstractFolder.py
>class AbstractFolder( java.lang.Object ) : pass
>
>----- PMS/Folder.py
>import AbstractFolder
>class Folder( AbstractFolder.AbstractFolder ) : pass
>
>
>I also have the following class as a factory for the GUI to create a
>hardcoded folder for the prototype demo.
>
>----- DemoFolder1.py
>class DemoFolder1( java.lang.Object ) :
>    def make( self , name ) :
>        """
>        @sig public Object make( String name )
>        """
>
>        server = PMS.MaildirServer.MaildirServer( "server_name" , "." )
>        PMS.Configuration.Configuration().servers[ server ] = lambda x : x
>        folder = PMS.Folder.Folder( server , name )
>        folder.create()
>
>        print folder.__class__ # correctly prints "PMS.Folder.Folder"
>        return folder
>
>
>
>I used jythonc to compile the stuff, and everything compiles fine.
>The Java code that uses this looks like :
>
>
>            Object folder = (new DemoFolder1()).make( "Demo1" );
>            MailMessage.Message message = new MailMessage.Message();
>
>            // This line prints out
>            // org.python.proxies.PMS.Folder$Folder$2
>            System.out.println( folder.getClass() ) ;

The strange classname comes from the dynamic proxy generation. Verify if jythonc
created a java class for the Folder class. You check that in the stdout from
jythonc where there should be a line like:

 Folder extends java.lang.Object

If no such line is written, it is because jythonc failed to detect that Folder
is a java subclass.

regards,
finn