Java classes in XPiNC

I am currently following Paul Clahoun’s excellent ILUG2010 presentation to retrieve data from RDBMS using SSJS ( http://nnsu.com/nnsusite.nsf/4305076ee31cdd708625727500671333/f3aaf6e81d4b0419862577d8005914f1?OpenDocument )

Creating custome java classes within the WebContent/WEB-INF location work fine when the code is run via a browser. When I open my xPage in the Notes client, the code just does not run. Is there anything obvious I am missing (security?)? There are no errors in the Notes log - the code just does not fire for some reason

TIA

Mike