Here is an excellent web page about Oracle webforms. It covers the Forms Server, lots of general stuff, how to implement java (PJC and beans) in your webform and an excelent how-to for using the JDAPI (with a class diagram of the JDAPI package). The nice thing about this page is that it is a “1-stop-shop” covering a lot of stuff I’ve gathered over the last years in countless OTN white-papers about the subject.