Database management :
–Database connection pooling
–DataSource, offered by the J2EE server. Needed to access connection pool of the server.
–Database access is configured to the J2EE server > easy to change database / database driver
Transaction management :
–Distributed transactions
–J2EE server offers transaction monitor which can be accessed by the client.
Security management :
–Authetication
–Authorization
–encryption
Enterprise java beans can be distributed /replicated into separate machines
Distribution/replication offers
–Load balancing, load can be divided into separate servers.
–Failover, if one server fails, others can keep on processing normally.
–Performance, one server is not so heavy loaded. Also, for example Weblogic has thread pools for improving performance in one server.