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EJB Interview Questions and Answers

  Difficulty Level: AllBeginnerIntermediateExpert

Ques 1. What is the difference between EAR, JAR and WAR file?

Ques 2. What is lazy loading?

Ques 3. Can I map more than one table in a CMP?

Ques 4. Is Decorator an EJB design pattern?

Ques 5. What is the difference between sessioncontext and entitycontext?

Ques 6. Does stateless Session bean create() method contain any parameters?

Ques 7. What is difference between EJB 1.1 and EJB 2.0?

Ques 8. Why does EJB needs two interfaces(Home and Remote Interface)?

Ques 9. What are the different kinds of enterprise beans?

Ques 10. What is Session Bean?

Ques 11. What is Entity Bean?

Ques 12. What is EJB client JAR file?

Ques 13. What are the methods of Entity Bean?

Ques 14. What is EJB container?

Ques 15. What is the difference between Container-Managed Persistent (CMP) bean and Bean-Managed Persistent(BMP)?

Ques 16. What is EJB server?

Ques 17. What are the callback methods in Entity beans?

Ques 18. What is software architecture of EJB?

Ques 19. Can Entity Beans have no create() methods?

Ques 20. What is bean managed transaction?

Ques 21. What are transaction attributes?

Ques 22. What are transaction isolation levels in EJB?

Ques 23. What do you mean by EJB?

Ques 24. What technologies are included in J2EE?

Ques 25. What is the difference between EJB and Java beans?

Ques 26. What is EJB role in J2EE?

Ques 27. What is in-memory replication?

Ques 28. What is software architecture of EJB?

Ques 29. What is the need of Remote and Home interface. Why cant it be in one?

Ques 30. What is bean managed transaction?

Ques 31. What is an EJB Context?

Ques 32. How can I call one EJB from inside of another EJB?

Ques 33. What happens if remove( ) is never invoked on a session bean?

Ques 34. What is EJB QL?

Ques 35. How EJB Invocation happens?

Ques 36. What are transaction attributes?

Ques 37. How can I call one EJB from inside of another EJB?

Ques 38. What is the difference between Message Driven Beans and Stateless Session beans?

Ques 39. 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?

Ques 40. What is the difference between find and select methods in EJB?

Ques 41. What is the difference between JavaBean and EJB?

Ques 42. What is abstract schema?

Ques 43. What is local interface. How values will be passed?

Ques 44. What is Message Driven Bean?

Ques 45. What are the services provided by container?

Ques 46. How many EJB Objects are created for a Bean?

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