Using JALPP within an Oracle Java stored procedure

I want to make a web service call into PP from an Oracle function using jalpp. Has anyone successfully done this? I keep getting NullPointerException errors from deep within the underlying jaxrpc code, and I'm not sure how best to fix it. I think I've got all my java classes loaded into Oracle correctly, but clearly I've done something wrong. I'd really prefer to use jalpp over the interesting and functional -- but scary! -- way June addressed a SOAP call directly from PL/SQL.

thanks!
Chris