[hibernate-dev] Hibernate ORM master - 5.0

[Steve Ebersole]

It was decided that the massive work for 5.0 including metamodel and all
the other changes was just taking too long, and that we'd split that work
up into a number of intermediate versions.  I wanted to highlight the
proposed breakdown and solidify the roadmaps.  The preliminary breakdown is
as follows:


   - 5.0
      - Java 6 or 7 (?)
      - EE 7 (JPA 2.1)
      - Wildfly 9
      - Timeline : Spring 2015
      - Required development
         - Transition to new bootstrapping APIs
         - MetadataSources, contributors, builders, etc for building
            SessionFactory
            - Keep Configuration as a migration aid, but align its
            processing and assumptions to follow new APIs
            - New naming strategy approach (implicit and physical split)
         - Pick "important" features from  metamodel work based on new
         bootstrapping API
            - automatic quoting of identifiers that are keywords
            - ???
         - Performance improvements
         - Cachng SPI changes based on feedback from Ehcahce and Infinispan
            - EntityKey proposal
            - Explore unifying entry keys for actual cache provider, cache
            SPI (CacheKey) and persistence-context (EntityKey)
            - Infinispan improvements, especially in local mode.  Will
            require integrating a new Infinispan version and possible
changes to
            hibernate-infinispan
            - ???
         - OGM integration
            - "after persisters built" hook
               - others?
            - Java 8 type support
            - Date/Time
            - Optional
         - Java 9 type support
            - Money/Currency
         - Optional development (as time, resources allow)
         - Discriminator based multitenancy
         - JAXB instead of dom4j.
         - extended orm.xml xsd, deprecating hbm.xml format
         - Jandex usage
         - JdbcSession
         - Hibernate Spatial integration (depends on level of dependence on
         metamodel)
      - 5.1
      - Java 6 or 7 (?)
      - EE 7 (JPA 2.1)
      - Widfly 9, or 10
      - Timeline : TBD (Fall 2016?)
      - Required development
         - slips from 5.0
         - new HQL parser
            - Antlr 3 or 4?
            - unified SQL generation? or limit to HQL parsing?
         - Optional development (as time, resources allow)
         - extend JPA criteria API with support for constructs from
         Hibernate's legacy criteria API
         - extend JPA criteria API with fluent support
      - Possibly - Override EAGER fetching with LAZY (fetch profiles, HQL,
      etc)
   - 5.2
      - (if needed)
      - Java 6 or 7 (?)
      - EE 7 (JPA 2.1)
      - Widfly 9, or 10
      - Required development
         - splits from 5.1
      - 6.0
      - SE and EE support levels TBD, but at least SE 8
      - Required development
         - metamodel


One additional consideration... I have been told (have not verified the
details yet myself) that Hibernate ORM will currently not run in Java 8 at
least in part because dom4j will not work in Java 8 (maybe just the version
we use?  again, have not verified details yet).  If running 5.x versions of
Hibernate in Java 8 is important to anyone, we might need to increase the
priority of moving to JAXB over dom4j.