Question - What do you mean by re-entrant? Can you say that session beans as re-entrant? Can entity beans be specified as re-entrant?
Answer -
If the entity bean is defined as re-entrant, then it is possible by multiple clients to associate with the Entity bean and get methods executed concurrently inside the entity bean. Synchronization is taken care of by container. There is an exception thrown when an entity beam is defined as non-re-entrant and numerous clients are connected to it concurrently to carry out a method.