Examples of javax.persistence.EntityManager.persist()

javax.persistence.EntityManager.persist()
Make an entity instance managed and persistent. @param entity @throws EntityExistsException if the entity already exists.(The EntityExistsException may be thrown when the persist operation is invoked, or the EntityExistsException or another PersistenceException may be thrown at commit time.) @throws IllegalStateException if this EntityManager has been closed. @throws IllegalArgumentException if not an entity @throws TransactionRequiredException if invoked on acontainer-managed entity manager of type PersistenceContextType.TRANSACTION and there is no transaction.

        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        em.joinTransaction();
        em.persist(myEntity);
        em.persist(myEntityMethods);
        em.persist(myEntityOnlyFields);
        utx.commit();
        em.close();
        Environment env = createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VariablePersistenceStrategySubProcess.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase, env );

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        EntityManager em = emf.createEntityManager();
        UserTransaction utx = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
        utx.begin();
        
        em.joinTransaction();
        em.persist(myEntity);
        utx.commit();
        em.close();
        Environment env = createEnvironment();
        KnowledgeBase kbase = createKnowledgeBase( "VPSProcessWithWorkItems.rf" );
        StatefulKnowledgeSession ksession = createSession( kbase , env);

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    if (parameters.length == 0)
      return null;
    EntityManager em = getContext().getEntityManager();
    if (parameters[0].getClass().isArray()) {
      for (Object entity : (Object[]) parameters[0]) {
        em.persist(entity);
      }
    } else {
      em.persist(parameters[0]);
    }
    return null;

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    if (parameters[0].getClass().isArray()) {
      for (Object entity : (Object[]) parameters[0]) {
        em.persist(entity);
      }
    } else {
      em.persist(parameters[0]);
    }
    return null;
  }


  @Override

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        logger.setCallbackClassName(callbackClassName);
        logger.setCallbackEvent(callbackEvent);
        logger.setClassName(className);
        logger.setInsertionDate(getTime());
        logger.setEntityId(entityId);
        entityManager.persist(logger);
        entityManager.flush();
    }


    /**
     * Finds a callback event that was called for the class in the className

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        logger.setCallbackEvent(event);
        logger.setClassName(className);
        logger.setInsertionDate(getTime());
        logger.setOperationType(operationType);
        logger.setDescription(description);
        entityManager.persist(logger);
        entityManager.flush();
    }


    /**
     * Creates an instance of OperationLogger with the parameters and the

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        CallbackLogger logger = new CallbackLogger();
        logger.setCallbackClassName(callbackClassName);
        logger.setCallbackEvent(callbackEvent);
        logger.setClassName(className);
        logger.setInsertionDate(getTime());
        entityManager.persist(logger);
        entityManager.flush();
    }
}

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        entityManager.getTransaction().begin();
        // creates a book
        Book book = new Book();
        book.setId(ID);
        book.setName(ENTITY_NAME);
        entityManager.persist(book);
        // makes a rollback
        entityManager.getTransaction().rollback();
        entityManager.close();
        // verifies if the container made the rollback
        Book bookResult = entityManager.find(Book.class, new Integer(ID));

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        entityManager.getTransaction().setRollbackOnly();
        // creates a book
        Book book = new Book();
        book.setId(ID);
        book.setName(ENTITY_NAME);
        entityManager.persist(book);
        // verifies if the container registered the rollback.
        assertTrue(entityManager.getTransaction().getRollbackOnly(),
                "The transaction is marked as rollback, but the container returned false for the method getRollbackOnly()");


        // tries to make the commit, the container must throw an exception.

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        entityManager.getTransaction().begin();
        // inserts a book
        Book book = new Book();
        book.setId(ID);
        book.setName(ENTITY_NAME);
        entityManager.persist(book);
        // verifies if the transaction is marked as ACTIVE
        assertTrue(entityManager.getTransaction().isActive(),
                "The transaction is active, but the container returned false when the method isActive was called.");
        // verify if the rollbackonly is not set.
        assertFalse(entityManager.getTransaction().getRollbackOnly(),

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