notes on schuchert jpa tutor 4

finally the last tutor at http://schuchert.wikispaces.com/JPA+Tutorial+4+-+Inheritance+and+Polymorphic+Queries

lets move!

• remember to rename BookAlreadyCheckedOut as ResourceAlreadyCheckedOut and BookNotCheckedOut as ResourceNotCheckedOut to get rid of compilation errors.
• the same issue as in http://hilaltarakci.blogspot.com/2009/10/notes-on-schuchert-jpa-tutor-3.html

now, all tests should pass..

well, time to go to my own project, thanks to schuchert, tutors are really helpful :)