Incorrect UDF class path/name results in Invalid JDBC username/password message trying to preview

1) open the attached Model Project Set for testing UDFs
2) set-up and start an EAP 6.1 + Teiid 8.4.x server
3) Select and preview "EMPLOYEE_VIEWS.EMPLOYEEDATA" table
4) Get an error dialog stating: "Validate the JDBC username & password in the default Teiid Instance"
5) Select "buildFullName()" procedure and change Java Class to: org.teiid.designer.examples.NameBuilder and SAVE
6) Select and preview same table
7) Preview works

Don't know if we can discover the REAL error, but this is confusing