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## javax.persistence
Annotation Type PersistenceUnit

    @Target(value={TYPE,METHOD,FIELD})
    @Retention(value=RUNTIME)
    public @interface PersistenceUnit

Expresses a dependency on an `EntityManagerFactory` and its associated persistence unit.

Since:
  Java Persistence 1.0

Optional Element Summary
`java.lang.String` | `name` (Optional) The name by which the entity manager factory is to be accessed in the environment referencing context; not needed when dependency injection is used.
`java.lang.String` | `unitName` (Optional) The name of the persistence unit as defined in the `persistence.xml` file.

### name

    public abstract java.lang.String name

  (Optional) The name by which the entity manager factory is to be accessed in the environment referencing context; not needed when dependency injection is used.

  Default:
    ""

### unitName

    public abstract java.lang.String unitName

  (Optional) The name of the persistence unit as defined in the `persistence.xml` file. If specified, the persistence unit for the entity manager factory that is accessible in JNDI must have the same name.

  Default:
    ""

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