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	EJB FAQs 1). What are the Differences between EJB 3.0 and EJB 2.1? 2). What are the key features of the EJB technology? 3). What is the difference between EJB and RMI 4). What are the ways for a client application to get an EJB object? 5). What are the different kinds of enterprise beans? 6). What is Entity Bean? 7). Why does EJB needs two interfaces(Home and Remote Interface)? 8). What is an EJB Context? 9). Does the container create a separate instance of the generated EJBHome and EJBObject classes? 10). What's difference between httpsession and EJB session bean ? 11). What are the key benefits of the EJB technology? 12). Why do we have a remove method in both EJBHome and EJBObject? 13). What are the services provided by container? 14). Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB? 15). What is the difference between a Coarse Grained? Entity Bean and a Fine Grained? Entity Bean? 16). Does Stateful Session bean support instance pooling? 17). What are the Interfaces need to create to implement Session Bean with Exmaple? 18). How many EJB Objects are created for a Bean? 19). What are the parameters must follow for Session Bean ? 20).When you will chose Stateful session bean and Stateless session bean? 21). What is the difference between Stateful session bean and Stateless session bean? 22). What are the callbacks method in Session Bean ? 23). How is Stateful Session bean maintain their states with client? 24). What is the free pool? 25). Without home and remote interfaces cant we implement ejb? 26). When are stateless EJBs passivated? 27). Is method overloading allowed in EJB? 28). What is handle and why it is used in EJB? 29). Implement Local and Remote Interfaces in EJB? 30). How can I call one EJB from inside of another EJB? 31). What is the difference between Message Driven Beans and Stateless Session beans 32). Can you control when passivation occurs? 33). How to call any EJB from a servlet/JSP/Java Client? 34). Can the primary key in the entity bean be a Java primitive type such as int? 35). What are the methods of Entity Bean? 36). What is the difference between Container-Managed Persistent (CMP) bean and Bean-Managed Persistent(BMP) ? 37). Can Entity Beans have no create() methods? 38). What is bean managed transaction? 39). What are transaction isolation levels in EJB? 40). What is the difference between ejbCreate() and ejbPostCreate 41). What is the difference between sessioncontext and entitycontext? 42). What is the difference between ejbStore() and ejbLoad()? 43). What is the difference between EAR, JAR and WAR file? 44). How to implement an entity bean which the PrimaryKey is an autonumeric? 45). Is Decorator an EJB design pattern? 46). What is lazy loading? 47). What is Message Driven Bean? 48). What is CMR? 49). Can a Session Bean be defined without ejbCreate() method? 50). What are the optional clauses in EJB QL? 51). Can I use session beans and hibernate (instead of entity beans) for persitance? 52). If session has thrown ApplicaitonException would you use EJBContext. setRollBackOnly method? 53). What is the difference between activation and passivation? 54). How do you check whether the session is active in Stateful session bean ? 55). What is the difference between find and select methods in EJB? 56). What is the difference between local interface and remote interface? 57). Why CMP beans are abstract classes? 58). What is the difference between normal Java object and EJB? 59). What is abstract schema? 60). What is clustering. What are the different algorithms used for clustering? 61). Why did I get a LockTimedOutException? 62). What is the life cycle of MDB? 63). Can an entity bean be a listener for JMS messages? 64). What is Entity Bean. What are the various types of Entity Bean? 65). What is IIOP ? 66). Why don't stateful session beans have a pool? 67). Without using entity beans can we do database transactions? 68). What is the use of using session facade design pattern in EJB'S? 69). What is the difference between session and entity beans? When should I use one or the other? 70). Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB? – 71). What is EJB role in J2EE? 72). What are Container-Managed Transactional attributes ? 73). How is persistence implemented in enterprise beans? 74). Are we allowed to change the transaction isolation property in middle of a transaction? 75). For Entity Beans, What happens to an instance field not mapped to any persistent storage, when the bean is passivated? 76). What is a Message Driven Bean, what functions does a message driven bean have and how do they work in collaboration with JMS? 77). What is the advantage of putting an Entity Bean instance from the Ready State to Pooled state? 78). What is Session Bean? 79). If my session bean with single method insert record into 2 entity beans, how can I know that the process is done in same transaction (the attributes for these beans are Required) 80). Can i map more than one table in a CMP? 81). Difference between SessionBean remove() and EntityBean remove() method? 82). Does each stateless session bean have its own EJBObject?