Can anyone let me know, which book is better for beginner to start studying. Also, if i want to start with WAS , do i need to learn J2ee technologies like EJB , JMS,JAAX, or any pre-requesites.
Sekhar, Yes, you need to know at least one J2EE concept before effectively using WAS. It's overwhelming to do both concurrently. Good starting points are Servlets (front end) and EJB (back end). What version of WAS are you using? That version will determine what version of J2EE you can use. And J2EE has changed enought that you'll get different book recommendations for earlier vs later versions.
i know servlets 2.4 and jsp also, as well certified in java se5, can you please suggest be any recommendations, as i don't know anything regarding websphere.
Though i am sure i am not that much enough in EJB but in JDBC and Hibernate.
Sekhar, That's good. Knowing about Servlets gives you enough knowledge to understand the server. I suggest looking at the redbook corresponding to the version of WebSphere you are using and work through deploying a servlet.
For EJB, you need to decide if you want to learn EJB 2.1 (WebSphere 6) or EJB 3.0 (WebSphere 7.5 beta) as they are quite different. I think going with EJB 3.0 is better at this point. For 3.0, I recommend "EJB 3.0 in Action".