What is EJB?

EJB Interview Questions and Answers

1. What is EJB?

EJB stands for Enterprise JavaBean and is a widely-adopted server side component architecture for J2EE. It enables rapid development of mission-critical application that are versatile, reusable and portable across middleware while protecting IT investment and preventing vendor lock-in.

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Other Interview Questions

• Are we allowed to change the transaction isolation property in middle of a transaction?
• Is there any way to read values from an entity bean without locking it for the rest of the transaction (e.g. read-only transactions)?
• Is it legal to have static initializer blocks in EJB?
• Why is ejbFindByPrimaryKey mandatory?
• Does the container create a separate instance of the generated EJBHome and EJBObject classes?
• Is method overloading allowed in EJB?
• 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?
• Is it legal to have static initializer blocks in EJB?
• Are we allowed to change the transaction isolation property in middle of a transaction?
• What is EJB role in J2EE?
• More...