javax.persistence

## Annotation Type PersistenceUnit

    @Repeatable(value=PersistenceUnits.class)
     @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

Optional Elements
`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.
`String` `unitName` (Optional) The name of the persistence unit as defined in the `persistence.xml` file.

### Element Detail

#### name

    public abstract 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 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:
  ""