What is unitName in @PersistenceContext?

[Debopam Poddar]

Please explain unitName in @PersistenceContext and what is its significance?

Can I put and String value as a unitName ?

[Mihai Radulescu]

Hi Debopam


The unit name for your persistence context represents the name for your persistence unit. Take a look in your persistnce.xml.
A persistence unit is a collection of classes around a database. You can have various persincence units according with your needs.

  <persistence-unit name="myUnit">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:/MYUnitDatasource</jta-data-source>

the injection for this will be :

@PersistenceContext(unitName="myUnit")

Regards,
Mihai