1)can you tell what is POJO ?
stands for Plain Old Java
I had asked this before.
What are you using for your DB?
Since you have chosen not to answer, I cannot help you out more on
...but i cont get records when i am entering email address like(firstname.lastname@example.org).
The answer to that problem would be more related to what DB your are using.
As a rule of the thumb, when working with GTW-RPC, one would
1) Invoke a RPC method
2) Arguments, if required, can be passed to this method
3) On the server side, query the DB, retrieve results, construct POJO(s) from the result set
4) Return the POJO(s) to the client
5) Process the data as required on the UI
More info here http://code.google.com/webtoolkit/doc/latest/tutorial/RPC.html
I would recommend dropping the GWT part for now. Write a simple DB code, which will query the DB and retrieve the results. Once you have the proper data you require, you can start building the RPC mechanism to return it to the client.
Please note, we have dedicated JDBC
forums which are the correct place to ask DB/ORM related questions.