Java J2EE Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java (6529)
Advanced Java (552)
Swing (223)
EJB (402)

Servlets (804)
Struts (701)
JDBC (771)
JMS (324)

SunOne (10)
J2EE (485)
Weblogic (694)
Websphere (573)

Java J2EE Interview Questions

Questions Answers Views Company eMail

Why do we use cache in hibernate?

384

Why do we need mapping?

355

What is one to many and many to many relationships one to many?

425

What is cascade persist?

400

What is collection mapping?

379

What is the difference between merge and merge join in ssis?

369

What is the purpose of mapping?

405

What does the session object hold?

362

What is entitymanager flush?

378

Why we are using jpa annotation instead of hibernate?

398

What is the difference between update and upgrade?

503

What is difference between getcurrentsession () and opensession ()?

450

Is merge better than update?

327

What is difference between eager and lazy loading?

435

What is primary key in er diagram?

399

Un-Answered Questions { Java J2EE }

a thread is runnable, how does that work? : Java thread

1021

Why are functions called methods in java?

1008

Name the exception class which is connected to the exceptions thrown by the applications?

385

What do you mean by the servlet chaining?

1086

Define inheritance with reference to java.

1096

How many JVMs can run on a single machine and what is the Just-In-Time(JIT) compiler?

1060

What is java transaction service (jts)?

984

Can two different jms services talk to each other? For instance, if a and b are two different jms providers, can provider a send messages directly to provider b? If not, then can a subscriber to provider a act as a publisher to provider b?

995

What is singleton pattern?

1125

What is HttpURL connection ?

1059

What is the java persistence api used for?

399

What are drawbacks of singleton class?

958

I don't have websphere installed on my web server how do I add to the websphere administration console ?

809

What is exception in java?

1093

What is difference between model and modelmap?

448

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