[Jython-users] unable to get a working PythonInterpreter with PySystemState

[Charlie G. <cha...@gm...>]

Hi,

I have some code like the following that attempts to set up a
PythonInterpreter with a special ClassLoader that has classes I'd like
to test on it
            PySystemState.initialize( System.getProperties(), null,
new String[0], testClassLoader );
            PythonInterpreter interp =3D new PythonInterpreter();
            interp.exec( "import edu.sc.seis.flow.tester.ANDTesterTest" );

Running it yields the following exception

Traceback (innermost last):
  (no code object) at line 0
Exception in thread "main" java.lang.NullPointerException
        at org.python.core.Py.isInstance(Py.java:1817)
        at org.python.core.__builtin__.isinstance(__builtin__.java:426)
        at org.python.core.Py.displayException(Py.java:966)
        at org.python.core.PyException.printStackTrace(PyException.java:100=
)
        at org.apache.maven.surefire.util.NestedCheckedException.printStack=
Trace(NestedCheckedException.java:164)
        at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBoo=
ter.java:760)

From what I can tell in Py.isInstance, the exception is Jython blowing
up because it isn't even set up enough to print out the real stack
trace.  If I call PySystemState.initialize without testClassLoader, I
can execute code in the interpreter, but naturally I can't get to the
classes that I want on testClassLoader.  The Jython classes are
available from testClassLoader, so I don't think that's the problem.
This is all on 2.2alpha1.

Is there something else I need to be doing?

Thanks,
Charlie Groves