What does @singleton annotation do?
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Why do we use ejb?
How many types of session beans are available in ejb?
What is ejb in weblogic?
how can u integrate ejb and hibernate? How can u call hibernateDAO methods in session bean?
What do you understand by session facade?
What are the key features of the ejb technology?
Explain the concept of connection pooling feature of ejb container?
What is Enterprise JavaBeans?
Basic types of Enterprise JavaBeans?
What is ptp model?
An instance of stateful session ejb when accessed simultaneously from more than one clients on same vm results in remoteexception or ejbexception. In case the client is a servlet thread, which of the techniques can be used to avoid remoteexception/ejbexception?
Enlist the changes in EJB 2.1 ?
Core Java 
