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  1. Container Mode
    The OSGi JPA specification does not define or support the notion of Container mode in JPA, only Java SE mode (using the JPA 2.0 javax.persistence.jdbc properties).
  2. Self-contained Persistence Bundles
    The OSGi JPA specification dictates that all entities and metadata for a given persistence unit must be contained within a single persistence bundle.
  3. jar-file Element
    Mostly because of (2), there is no support for the jar-file element in the persistence descriptor. All entities must be in the persistence bundle and on the bundle classpath.
  4. JPA Provider
    Gemini JPA only supports EclipseLink as the JPA provider
  5. JTA Transactions
    Primarily because of (1), only the RESOURCE_LOCAL transaction type is supported. Support for JTA transactions is not currently offered.

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