Week 1 - EJB Intro

Question 1

What are EJBs?

Answer 1

Server side components/java objects that implement business logic.
Clients interact with EJBs through container interface.

Question 2

What is resource pooling?

Answer 2

Expensive JDBC connection is shared between EJB instances.

Question 3

What does the EJB container do?

Answer 3

1. Provides interface for clients
2. manages pools, resources, transactions, concurrency, security
3. Manages lifecycle of EJB and dependency injection

Question 4

When do POJOs become EJBs?

Answer 4

When you add the annotation.

ex:
import jakarta.ejb.Stateless;

@Stateless
…

Question 5

What are the 3 kinds of EJBs?

Answer 5

Session beans
Message-Driven beans
Entity beans