java - Hibernate JPA persistance method to use optimistic transactional semantics -

in api org.apache.openjpa.persistence interface openjpaentitymanager specifices

  void  setoptimistic(boolean opt)        whether use optimistic transactional semantics. method 

i looking similar method or in way mention set optimistic "false" using hibernate persistence. went through api , google not able find out. body please on this.