Why do we require to write a deployment descriptor (ejb-jar.xml) in an xml format ? why don't we write it in a java file ?

Is there any special reason to write two interfaces in ejb(local , home interfaces ). why don't we write only one interface .

Why is JNDI used.Do we have any alternative for JNDI?

How to map the Entity Bean field with Oracle?

What is metadata annotation?How it is useful in EJB 3.0?

Knowing that EJB encapsulates business logic in a web application, how does EJB actually do it in a application server ?

How to find who has given request (caller) to Business method of your application(SLSB)

What are the main metrics we have to monitor in JBoss Server?