What is TopLink Essentials?
TopLink Essentials is a freely licensed and distributed open-source community edition of Oracle TopLink, and it provides core Object-Relational Mapping (ORM) functionality necessary for the reference implementation of JPA in EJB 3.0. TopLink Essentials is available in source and binary distributions as the entity-persistence module of GlassFish Open Source Java EE 5 Application Server or it can be separately downloaded from OTN. The OSI-approved CDDL license is being used for project GlassFish which allows developers to view, use, edit, and alter the code, and distribute it or use it in production. More on TopLink Essentials and JPA can be found in this FAQ.
TopLink Essentials is the open-source community edition of Oracle’s TopLink product. It is derived from Oracle TopLink providing core Object-Relational Mapping (ORM) functionality necessary for the reference implementation of JPA in EJB 3.0. TopLink Essentials is available in source and binary distributions as the entity-persistence module of GlassFish Open Source Java EE 5 Application Server or can be separately downloded from here.