Is it possible to use a hbm xml Hibernate configuration to build an EntityManagerFactory and EntityManager in a JPA 2.0-compliant manner? The documentation seems to indicate this isn’t possible:
“The previous tutorials used the Hibernate-specific hibernate.cfg.xml configuration file. JPA, however, defines a different bootstrap process that uses its own configuration file named persistence.xml.”
—Chapter 4
My hbm xml configuration is many thousands of lines long and works; I’d rather not have to rewrite by hand as orm.xml and persistence.xml. I also don’t have write access to the data model to add Hibernate or JPA annotations. For my purposes I only need the JPA API, not the JPA configuration.
Is there any way to accomplish this?
Yes, it is possible. Existing mappings can be used by setting following property in persistence.xml:
Value is path to hibernate specific configuration. It is also possible to partially override hibernate style mappings with JPA mappings. Additional instructions can be found from documentation: http://docs.jboss.org/hibernate/core/4.0/hem/en-US/html_single#d0e708