Roadmap 6.1

• Unified mapping schema - HHH-15251
  • New mapping.xsd which is based on JPA's orm.xml but adds Hibernate extensions based on legacy hbm.xml mappings
  • "XML override" (partial XML mappings) support for Hibernate extensions
  • hbm.xml now "fully" deprecated
  • Transformation of hbm.xml mappings into mapping.xml documents
    • at build-time via plugins and tasks
    • at run-time - on-the-fly transformation can be opted-in to for 6.1. Eventually, the ability to not opt-in to that behavior will be removed, at which time hbm.xml documents will not be supported at run-time.
• JDBC Array support - HHH-10999
• Subquery in FROM clause support for HQL and Criteria - HHH-3356