One of the major themes of Java EE 7 and JPA 2.1 is multi-tenancy and EclipseLink, the JPA 2.1 reference implementation, has blazed the trail by shipping support for both multi-tenancy and tenant specific extensions in the Eclipse Indigo release. EclipseLink multi-tenancy enables the use of a single persistence unit by multiple tenants while keeping their data isolated and secure.
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JPA2.1 does NOT include multi-tenancy support.