Can anybody please explain, Difference between JBoss AS 4.2.1 and JBoss AS 5.1.0 ?
Main difference is that JBoss5 supports JavaEE5.
Also the default JMS provider has changed from JBossMQ to JBossMessaging, TransactionManager is different, and so on.
You should read the documentation of 5.1.
If you have more specific questions you might ask.
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