If X clients find the same entity bean, will there be X caches in the container?
If X clients connect (via a findXXX method to the same Entity EJB, will there be X copies of the cache in the container or will the container serialize access to a single Entity EJB?
The answer could be found in the EJB 2.0 Specs:
10.5.10 - Concurrent access from multiple transactionsSome containers do activate many instances, while others do prefer to serialize multiple access to one single instance.
When writing the entity bean business methods, the Bean Provider does not have to worry about concurrent access from multiple transactions. The Bean Provider may assume that the container will ensure appropriate synchronization for entity objects that are accessed concurrently from multiple transactions.
By default, the latest version of WebLogic would create X instances.