ejb 2

[Pedro Vázquez]

Hi

How much EJB 2 do you need to know in order to clear SCEA 5? Is it necessary at all? Will we be asked about EJB 2 versions in exam Part I?

I feel a little bit confused about this.

1) You can read in EJB 3.0 specs (ejb-3_0-fr-spec-ejbcore.pdf) pag 121:

"contracts for EJB 2.1 Entity Beans with Container-Managed Persistence, and the contracts for EJB 2.1 Entity Beans with Bean-Managed Persistence" ... "are required to be supported by EJB 3.0 implementations."

2) One of the objectives (Section 4: Business Tier Technologies) says

"Explain and contrast the following persistence strategies: container-managed persistence (CMP) BMP..."

so it seems we´re expected at least to know what CMP and BMP are but " stricto sensu" they aren´t used anymore in EJB3

I´ve been working with EJB3 for a couple of years but i don´t know nearly anything about previous versions.

Do I need to read something on ejb 2? How much? Any recomended book/ article on this particular subject ? I have to study a lot yet so a brief source of information would be very appreciated not a whole book on EJB 2

Thanks

[Hong Anderson]

No need.

[Pedro Vázquez]

thank you very much

that´s what i wanted to hear

nevertheless i found this in 'SCEA Sun® Certified Enterprise Architect for Java™ EE Study Guide'

Chapter 7

List the Required Classes/Interfaces That Must Be Provided
for an Enterprise JavaBeans Component . . . . . . . . . . . . . . . . . . . 361
Classes and Interfaces Prior to EJB 3.0 . . . . . . . . . . . . . . . . 361
Classes and Interfaces for EJB 3.0 . . . . . . . . . . . . . . . . . . . . 363

State the Benefits and Costs of Container-Managed Persistence . . . . 416
Managing Persistence (Prior to EJB 3.0) . . . . . . . . . . . . . . . 416
EJB Clients (Prior to EJB 3.0) . . . . . . . . . . . . . . . . . . . . . . 424
Entity Beans (EJB 3.0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426

Maybe if I have time i´ll have a look on it to learn a little bit more and just in case i could need it on the future

[Cameron Wallace McKenzie]

EJB 2 knowledge is small. Really, the questions mostly revolve around what the main differences are between EJB3 and EJB2. If you read up on EJB3, you'll end up reading plenty of descriptions on why the new, EJB3 approach is an improvement over EJB2.x.

-Cameron McKenzie