Hi All, I'm looking at the alternatives that are available for building the persistence layer of a application in Tapestry 5 and I would be happy to hear your opinion about a couple of topics:
1) I see that there is a support library for JPA and JPA2 (http://kenai.com/projects/tapestry-jpa) but the description page at Kenai says that the project was started on september 2009 so I wonder: Is this library already mature and usable, even for production? 2) Is it better to use JPA/JPA2 or Hibernate3 with Tapestry 5? Why? (I would probably stick with Hibernate but I'm open to suggestions.) 3) In his Jumpstart's FAQ, Geoff Callender says: "Why did the Data Access Object pattern ever exist? As I recall it had two purposes: to abstract away the data sources, and to hide the implementation of accessing the data. That is exactly what JPA (Java Persistence Architecture, also known as EJB3 Persistence) does too. So I argue that JPA has taken the place of the DAO and there's no need for us to write our own. JumpStart uses JPA as its DAO." (see: http://jumpstart.doublenegative.com.au/faq.html) What do you think about this? Would you use the JPA entity also for hosting some business logic? Would not this approach represent a net lost of flexibilty (because of a lack of "loose coupling")? 4) Is there any good tutorial or any good working demo regarding the use of Hibernate and/or Jpa with Tapestry5? At the moment I'm studying/using the following tutorials and demos/apps. a) HLS "quickstart" Maven archetype and "quickstart" tutorial at http://tapestry.apache.org/ . (This does not cover any persistence topic at all). b) "Tapestry for non believers" (http://www.infoq.com/articles/tapestry5-intro) (No persistence/ORM covering) c) AppFuse 2.1 (http://appfuse.org/display/APF/Home) (very good "example" - covering persistence, security and a lot of other topics - but also quite large and complex) d) Tapestry Jumpstart (http://jumpstart.doublenegative.com.au/) (very good but not covering Hibernate/JPA) Is there anything else around worth mentioning? TIA -- Alessandro Bottoni Website: http://www.alessandrobottoni.it/ "Beauty is a form of genius - is higher, indeed, than genius, as it needs no explanation." -- Oscar Wilde
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