By Mike Keith, Merrick Schincariol, Jeremy Keith
ISBN-10: 1430219564
ISBN-13: 9781430219569
ISBN-10: 1430219572
ISBN-13: 9781430219576
Probably i'm obdurate, or even simply rational, yet I see no cause to strength EJBs on myself whilst there are numerous less complicated and extra strong methods of doing things.
The complete ebook, apart from one bankruptcy on Java SE, assumes that you're wiring every thing, together with transactions with EJBs.
I may recommend the endurance with Hibernate booklet (which refers to hibernate implementation of JPA in addition to Hibernate particular APIs) even more details, laid out cleanly and doesn't suppose EJBs for each example.
And i do know the e-book is for JPA 2, yet on a few pages they jst have notes that say "XX was once no longer brought till JPA2, and for JPA1 you want to do it differently." YEAH? HOW?!
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Extra info for Pro JPA 2: Mastering the Java™ Persistence API (Expert's Voice in Java Technology)
Sample text
The code for a method that looks up and returns the Employee with a given id is now trivial and shown in Listing 2-4. Listing 2-4. class, id); } In the case where no employee exists for the id that is passed in, then the method will return null because that is what find() will return. Removing an Entity Removal of an entity from the database is not as common as you might think. Many applications never delete objects, or if they do they just flag the data as being out of date or no longer valid and then just keep it out of sight of clients.
Object-relational mapping with JPA is entirely metadata-driven. It can be done either by adding annotations to the code or using externally defined XML. The objects that are persisted are only as heavy as the data that is defined or mapped with them. Nonintrusiveness The persistence API exists as a separate layer from the persistent objects. The persistence API is called by the application business logic and is passed the persistence objects and instructed to operate upon them. So even though the application must be aware of the persistence API, because it has to call into it, the persistent objects themselves need not be aware.
What they found was a range of proprietary persistence frameworks, both commercial and open source. Many of the products that implemented these technologies adopted a persistence model that did not intrude upon the domain objects. For these products, persistence was nonintrusive to the business objects in that, unlike entity beans, they did not have to be aware of the technology that was persisting them. They did not have to implement any type of interface or extend a special class. The developer could simply treat the persistent object like any other Java object, and then map it to a persistent store and use a persistence API to persist it.
Pro JPA 2: Mastering the Java™ Persistence API (Expert's Voice in Java Technology) by Mike Keith, Merrick Schincariol, Jeremy Keith
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