Can ME 5.5M2 EE5 ….

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  • #268866 Reply


    I’m impressed with the EE5 enhancements in the new 5.5m2. Some questions please;

    1. What is the difference between JPA & EJB3? (Reverse engineer and/or otherwise.)

    2. Does 5.5m2 include a JP QL editor for ad-hoc queries? (like the sql editior)

    3. Can I use UML to design ejb 3 entities and forward engineer them into a ejb 3 project? I am looking for the uml to ‘understand’ ejb3 entities, without doing ‘tricks’ to make it work.

    Thank you.

    #268916 Reply

    Riyad Kalla

    I’m not an expert, but I think these are mostly accurate (or complete fabrications :))

    1) JPA is the persistence technology for mapping entities to the DB. EJB3 spec is much broader and encompasses that idea along with the idea of container-managed transactions, bean pooling, load balancing and all that “enterprisey” stuff.

    2) JP QL?

    3) For EJB3 you need annotations, and the UML designer doesn’t generate annotated classes at the moment, so no.

    #268949 Reply


    2. The Query language from J2EE, is named EJB-QL (EJBQL).
    The EE5 (ejb3) query language is named JP-QL (JPQL), Java Persistence Query Language.

    #268961 Reply

    Riyad Kalla

    Ahh gotcha, no we don’t have a view for real time JP-QL yet.

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