RE: [Jython-users] RE: class loader bug?

[Stefan B. <Ste...@tr...>]

Well, sys.path supports jar files, that is true. However sys.path is used to
search for *.py files not for *.class files. 

If it is a standalone jython application and you want to load classes
outside of the startup class path, then yes, you have to create your own
class loader. 

stefan

-----Original Message-----
From: Austine Jane [mailto:jan...@ho...]
Sent: Thursday, July 24, 2003 11:38 AM
To: jyt...@li...
Subject: [Jython-users] RE: class loader bug?


Thank you for your reply.

>The first thing that bothers me is append('junit.jar') is not an actual
>  physical path. May be something like :
>

junit.jar was in the current directory.

>  append('c:\\junit-3.8.1\\junit.jar') or  
>append(r'c:\junit-3.8.1\junit.jar')
>   will do better. If you want to check how Jython search for jar files you

>can

It doesn't work either.

>  turn on the "python.verbose" property.  		Properties jyProp =
new 
>Properties();
>  		jyProp.setProperty(
>  			"python.cachedir",
>  			System.getProperties().getProperty("user.home") +
>  "/.myjython/cachedir");
>   		jyProp.setProperty("python.verbose",
>  JythonPlugin.getResourceString("python.verbose"));
>   		/*
>  		 * Normally, Jython can only provide access to public
>  members of classes.  		 * However if this property is set
to false and 
>you are
>  using Java 1.2  		 * then Jython can access non-public fields,
methods, 
>and
>  constructors.   		 */
>  		jyProp.setProperty(
>  			"python.security.respectJavaAccessibility",
>
>  
>JythonPlugin.getResourceString("python.security.respectJavaAccessibility"))
;
>   		Properties sysProp = (Properties)
>  System.getProperties().clone();
>   		PythonInterpreter.initialize(sysProp, jyProp, new
>  String[0]);
>  		PythonInterpreter pi = new PythonInterpreter(null, new
>  PySystemState());
>   Further, I was under impression that sys.path is only used to search for
>  python modules. The java class path is controlled with :

As I understand from the docs, sys.path works for jar files as well. Doesn't

it?
Should I have to set CLASSPATH in accordance with it?

>   PySystemState.packageManager.addJar(r'c:\junit-3.8.1\junit.jar', true);
>   And again, addJar does not create an actual class loader. addJar only 
>helps
>  to parse the import statements. If you try to instantiate the class you 
>will
>  get ClassNotFoundException. So you have to specify your own class loader,
>  like this:   PySsystemState state = new PySystemState();
>  state.setClassLoader(TestCase.class.getClassLoader());
>  PythonInterpreter pi = new PythonInterpreter(null, new PySystemState());
>   This will do the trick.
>   Again this is all from the perspective of embedding Jython in Java code.

>   If you want to have a standalone jython application just put junit.jar 
>in
>  your class path.

It's a kind of a standalone jython application. However, I'd like to load 
Java classes
dynamically from jython(CLASSPATH is fixed at the point VM starts). Should
I implement my own ClassLoader(such as URLClassLoader)?

>  hope it helps,  Stefan
>

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