Is there any Transaction Isolation problem with entityManager.find(class, id) ?

Environment

• Enterprise Application Platform (EAP)
  • 4.2
  • 4.3
  • 5.0
• Java Persistence API (JPA)

• Flow is the following:

  T1 = transaction 1
  T2 = transaction 2
  T1 begin
  T1 price = em.find(Price.class, id); => value is 100
  T2 begin
  T2 price = em.find(Price.class, id); => value is 100
  T1 em.lock(price , LockModeType.WRITE);
  T2 em.lock(price , LockModeType.WRITE); => WAITS UNTIL T1 COMMITS
  T1 price.setValue(price.getValue() + 1); => new price is 101
  T1 commits
  T2 price.setValue(price.getValue() + 1); => new price is 101
  T2 commits
  => price = 101 => WRONG, should be 102