I've a session bean wich on his @PostConstruct callback method tries to load the database on first time.

The problem is that i'm constantly getting an error of type "EntityManager must be access within a transaction". I've tried to get a user transaction from
the injected session context but I'don't get it working.

this is the code I've

@PostConstruct
public void postConstructCallback()
{

System.out.println("LanguageBean. postConstructCallback(). Started.");

EntityManager manager;
Integer intTableSize;

// EntityTransaction transaction = manager.getTransaction();
//UserTransaction transaction = context.getUserTransaction();

//manager = emf.createEntityManager(PersistenceContextType.EXTENDED);

try
{
//Query query = manager.createQuery("SELECT count(language) FROM Language language");
//intTableSize = (Integer) query.getSingleResult();

/*
if ( transaction != null && intTableSize == 0 )
{
transaction.begin();
this.loadDatabase(manager);
}
*/
System.out.println( "YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY" );
System.out.println( this.getAll().size() );
System.out.println( "YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY" );
}
catch (Exception e)
{
/*
try {
transaction.rollback();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SecurityException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SystemException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
*/
System.out.println("LanguageBean. postConstructCallback(). Rollback due to errors.");
e.printStackTrace();
}
finally
{
}

System.out.println("LanguageBean. postConstructCallback(). Ended.");