RE: [Jython-dev] help!

[Kevin S. <se...@mo...>]

this could be a classloader issue.  well, not so much of a classloader =
issue as an issue with how jython finds java classes.  essentially, it =
just looks at the value of the system property java.class.path to find =
jars/classes it thinks it should know about.  however, if you are using =
something like a servlet container that uses a specialized classloader =
(i.e. one that adds all jars in some lib directory to the classpath), =
jython probably won't find classes that you think it should.

one way to work around this is to use PySystemState.add_extdir() to add =
extra directories to the list where jython will look for (and process) =
jars.

here's a little snippet of code we use to do this:

   // initialize jython runtime
   Properties jythonProps =3D new Properties();
   String motiveHome =3D Config.getProperty("motive.home");
   File pythonHome =3D new File(motiveHome, "jython");
   jythonProps.setProperty("python.home", pythonHome.getAbsolutePath());
   PySystemState.initialize(System.getProperties(),
                            jythonProps,
                            new String[]{""});

   // add extra directories in which jython should look for jars.
   // jython.extradirs property can be a comma-separated list of
   // extra dirs.  any directories listed that are not absolute
   // paths will have motive.home prepended to them.
   String jythonExtraDirs =3D Config.getProperty("jython.extradirs",
                                               "tomcat/lib");
   StringTokenizer st =3D new StringTokenizer(jythonExtraDirs, ",");
   while (st.hasMoreTokens()) {
       String s =3D st.nextToken();
       File dir =3D new File(s);
       if (!dir.isAbsolute()) {
           dir =3D new File(motiveHome, s);
       }
       PySystemState.add_extdir(dir.getAbsolutePath(), true);
   }

-----Original Message-----
From: Wilcox, Jim [mailto:JW...@cr...]
Sent: Friday, October 25, 2002 3:33 PM
To: 'jyt...@li...'
Subject: [Jython-dev] help!


Dear Jython Developers,

I have a java application and an attempting to integrate a Jython =
utility another developer wrote into it and call it within my java code. =
Using your documentation it appeared I needed to embed the Jython =
utility using PythonInterpreter but it pukes on any import java module.

What am I doing wrong, or is what I am attempting to do not supported?

Thanks in advance for any help!

Jim=20

Here is my puking attempt:

package test.creekpath.verification.AIMaze.utilities;

import org.python.util.PythonInterpreter;
import org.python.core.*;

import java.util.Properties;

public class JythonOperations
{
            public void runcatsutility() //String[] inputparameters
            {
                        Properties jythonsysprops =3D new Properties();

                        Properties jythonregprops =3D new Properties();

                        jythonregprops.setProperty("python.home",
                                                                         =
                       "/jython-2.1");

                        jythonregprops.setProperty("python.path",
                                                                         =
                       "/jython-2.1");
//put back in if need
/*
                        jythonregprops.setProperty("python.cachedir ",
                                                                         =
                       "/jython-2.1/cachedir");
*/

                        PythonInterpreter.initialize(jythonsysprops,
                                                     jythonregprops,
                                                 new String[0]); =
//String[] argv

                        PythonInterpreter interp =3D
                            new PythonInterpreter();

                        System.out.println("Loading Cats Utility");
            interp.execfile("C:\\jython-2.1\\__run__.py");

            } //end method runcatsutility
} //end class JythonOperations

Here is the bat file that works running from the Jython directory:

@echo off
rem set JAVA_HOME=3DC:\Program Files\JavaSoft\JRE\1.3.1

set ARGS=3D

:loop
if [%1] =3D=3D [] goto end
        set ARGS=3D%ARGS% %1
        shift
        goto loop
:end

set SYMPY_HOME=3DC:\jython-2.1
set JAVA_HOME=3Dc:\AIM\ThirdParty\jdk1.3-win32


"%JAVA_HOME%\bin\java.exe" "-Dpython.home=3D%SYMPY_HOME%" -classpath =
"%SYMPY_HOME%\jython.jar;%SYMPY_HOME%\jylib.jar;C:\AIM\ThirdParty\Oracle\=
JDBC\lib\classes12.zip" org.python.util.jython __run__.py %ARGS%