Examples of javax.persistence.EntityManager.clear()

javax.persistence.EntityManager.clear()
Clear the persistence context, causing all managed entities to become detached. Changes made to entities that have not been flushed to the database will not be persisted. @throws IllegalStateException if this EntityManager has been closed

    EntityManager em = getPersistenceContext(arg2 != LockModeType.NONE);
    try {
      return em.find(arg0, arg1, arg2);
    } finally {
      if(em == detachedManager)
        em.clear();
    }
  }


  /**
   * @throws TransactionRequiredException if lock mode is not NONE

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    EntityManager em = getPersistenceContext(arg2 != LockModeType.NONE);
    try {
      return em.find(arg0, arg1, arg2, arg3);
    } finally {
      if(em == detachedManager)
        em.clear();
    }
  }


  public CriteriaBuilder getCriteriaBuilder()
  {

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    EntityManager em = getPersistenceContext(false);
    try {
      em.setProperty(arg0, arg1);
    } finally {
      if(em == detachedManager)
        em.clear();
    }
  }


  public <T> T unwrap(Class<T> arg0)
  {

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    EntityManager em = getPersistenceContext(false);
    try {
      return em.unwrap(arg0);
    } finally {
      if(em == detachedManager)
        em.clear();
    }
  }
}

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                    entityManager = entityManagerFactory.createEntityManager();
                }
                // Let's clear the entity manager session to ensure we don't have any data left from previous transaction used by this thread
                // Any caching of data should be handled through the second level cache and not by caching it between two transaction in the
                // entity manager.
                entityManager.clear();
                entityManager.getTransaction().begin();
                ENTITY_MANAGER_CACHE.set(entityManager);
            }


            @Override

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      link(osoby[i], projekt1);
    for (int i=0; i<MEMBER_COUNT_PROJEKT2; i++)
      link(osoby[osoby.length-i-1], projekt2);
        
    em.getTransaction().commit();
    em.clear();
  }


  public void tearDown() throws Exception {
    super.tearDown();
  }

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  public void testQueryWithUnmanagedPersistentInstanceAsParameter() {
    EntityManager em = emf.createEntityManager();
    Projekt projekt1 = em.find(Projekt.class, ID_PROJEKT1);
    Projekt projekt2 = em.find(Projekt.class, ID_PROJEKT2);
    em.clear();
    assertFalse(em.contains(projekt1));
    assertFalse(em.contains(projekt2));
    
    queryWithParameter(em, projekt1, projekt2);
  }

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        em.merge(o);
        batchSize++;


        if (batchSize >= config.getBatchSize()) {
          em.flush();
          em.clear();
          batchSize = 0;
        }


        o = marshaller.objectFromObjectStream(ois);
      }

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    yellowSubmarine.setCommander( beetles );
    yellowSubmarine.setName( "Yellow" );
    yellowSubmarine.setSize( 13 );
    em.persist( yellowSubmarine );
    em.flush();
    em.clear();
    yellowSubmarine = em.find( Submarine.class, yellowSubmarine.getId() );
    yellowSubmarine.setSize( 3 );
    try {
      em.flush();
      fail("Event not wired");

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    c.setName( "Kitty" );
    c.setDateOfBirth( new Date( 90, 11, 15 ) );
    em.getTransaction().begin();
    em.persist( c );
    em.getTransaction().commit();
    em.clear();
    em.getTransaction().begin();
    c = em.find( Cat.class, c.getId() );
    assertFalse( c.getAge() == 0 );
    c.setName( "Tomcat" ); //update this entity
    em.getTransaction().commit();

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