Forms and PL/SQL cannot see custom java class

We have an R12.1.3 environment running on and 11.2.0.4 database.

I have followed note 362663.1 to create and deploy a custom class file (AppsPasswordValidationCUS.java) to make password validation stronger.  It works perfectly in all OAFramework pages (User Management, Supplier Contact Directory, Forgot My Password).  In the Define user form I get the message that it cannot find the class file defined in the FND_SIGNON_CUSTOM profile option.  When we run our custom user maintenance script which calls the fnd_user apis, it fails with the same message when inserting new users.  The class is successfully uploaded into the database and a class file is in the location as set in the profile option.  Where have I