I learning ejb, im not sure about my answer
I would think sesisonbean are single threaded and entity beans are multithreaded.
For SessionBeans, there will be several session bean instances in the pool and each will fullfill the request for each client business method call.
After fullfilling the request of the client, the bean goes back to the pool.
Since each bean is for each client, it is single threaded.
But for Entity bean, each bean can handle multiple request from the client, so it is multithreaded.
Is it correct?