Java Interview Questions

Q) What are stored procedures? How is it useful?
A) A STORED PROCEDURES is a set of statements/commands which reside in the database. The stored procedure is pre-compiled and saves the database the effort of parsing and compiling sql statements every time a query is run.
Each database has its own stored procedure language, usually a [...]

Q) Why does EJB needs two interfaces(Home and Remote Interface)
A) There is a pure division of roles between the two .
Home Interface is the way to communicate with the container which is responsible for creating , locating and removing beans and Remote Interface is the link to the bean that allows acces to all methods [...]

Q) How many EJB Objects are created for a Bean?
A) For a Session bean - one EJB object for one bean instance.
For entity bean - it depends , if 2 users are accessing one row at a time then one EJB object is used for both the beans other wise for each bean one EJB [...]

Q) What is software architecture of EJB?
A) Session and Entity EJBs consist of 4 and 5 parts respetively:
1. A remote interface (a client interacts with it),
2. A home interface (used for creating objects and for declaring business methods),
3. A bean object (an object, which actually performs business logic and EJB-specific operations).
4. A deployment descriptor (an [...]