CODEWITHSUNDEEP
jpapersistence-unit
JBT
JBT

Reputation: 8746

How to get persistence unit name from EntityManager

Is it possible to get the associated persistence unit name of an EntityManager object? For example, you have 

@PersistenceContext( unitName="fooPU" )
private EntityManager em;

Is it possible to get the name fooPU from em? The motivation for this is that I want to have a small test to verify that the injected em through @Inject is associated with the right persistence unit.

Upvotes: 7

Views: 11272

Answers (2)

Victor_Magalhaes
Victor_Magalhaes

Reputation: 51

You can just add another "property" inside the "properties" part of file persistence.xml.

Example:

<persistence-unit name="pu-foo" transaction-type="JTA">

  <jta-data-source>jdbc/some-name</jta-data-source>

  <!-- other fields/properties -->

    <properties>
    
      <property name="persistence-unit-name" value="pu-foo" />

      <!-- other fields/properties -->

    </properties>

</persistence-unit>

And, inside your java code, let suppose you have an EntityManager called myEM...

System.out.println(myEM.getEntityManagerFactory().getProperties().get("persistence-unit-name"));

Or...

System.out.println(myEM.getProperties().get("persistence-unit-name"));

The property "persistence-unit-name" appears in properties of both myEM and myEM.getEntityManagerFactory().

That would print "pu-foo"

I hope that could help someone that still have this need.

Upvotes: 0

MBBA
MBBA

Reputation: 97

the persistance unit name is under the key "hibernate.ejb.persistenceUnitName" in the properties Map

String puName = em.getEntityManagerFactory().getProperties().get("hibernate.ejb.persistenceUnitName").toString()

Upvotes: 8

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