This week's book giveaway is in the Testing forum. We're giving away four copies of Data Structures the Fun Way: An Amusing Adventure with Coffee-Filled Examples and have Jeremy Kubica on-line! See this thread for details.
If the session bean instance allocates resources in the ejbCreate<METHOD>(...) method and/or in the business methods, and normally releases the resources in the ejbRemove() method, these resources will not be automatically released in the above scenarios. The application using the session bean should provide some clean up mechanism to periodically clean up the unreleased resources. ---------------
If I open database connection in the ejbCreate and close in the ejbRemove, how can I maintain the opened connection which are never been closed?
If you are concerned only about pooled connections (database,resource manager etc), closing the pooled connection in each business method is a very good idea. Since these are pooled, the overhead for returning a connection back to the pool is minimal (just a local invocation on a method in the call stack).
If you are maintaining connectivity to some external legacy systems and it is imperative for you to hold on to your socket connections over multiple business method calls due to a huge overhead in reacquiring socket connections, you could set the socket connection timeouts while acquiring your socket connection. This would ascertain these resources being released even if the ejbRemove() method does not get called.