[Jython-users] Setting the Jython classloader

[David H. <dav...@gm...>]

Hi,

I am trying to embed my Jython code in a Java program, Eclipse to be
exact, and I'm having trouble with class loading.  My Python code
fails to load classes that I know are accessible in the Java context
where the PythonInterpreter was created.  How can I make a
PythonInterpreter able to use the same classes that are accessible in
the code that creates it?  I tried creating a PySystemState and
setting its classloader, but it didn't work:

try {
    Class.forName("org.eclipse.jface.viewers.IStructuredContentProvider");
    System.out.println("Successfully loaded IStructuredContentProvider
by name from Java");
} catch (Exception e) {
     System.out.println("Failed to load IStructuredContentProvider by
name from Java");
}
PySystemState.initialize();
PySystemState state = new PySystemState();
state.setClassLoader(Thread.currentThread().getContextClassLoader());
PythonInterpreter interpreter = new PythonInterpreter(null, state);
try {
    interpreter.exec("from org.eclipse.jface.viewers import
IStructuredContentProvider");
} catch (Throwable t) {
    System.out.println("Failed to import IStructuredContentProvider:
" + t.toString());
}

The class was loaded successfully in Java, but not in Python:

Successfully loaded IStructuredContentProvider by name from Java
Failed to import IStructuredContentProvider:  Traceback (innermost last):
  File "<string>", line 1, in ?
ImportError: no module named jface

How should this be done?

-David