By using innerHTML in jsp page which need to populate the data from database in to that page without refreshing that.

Several ways of accomplishing this:

» Pushlets
The whole premise of pushlets is to refresh data without refreshing the page.

» JSRS
A similar technology with a JavaScript framework.

» A discussion on IBM.com regarding remote scripting technologies

In the past, I've implemented a remote scripting-ish solution using a hidden frame. People might argue with this approach and it's inherent difficulties, however it is up and working on a Fortune 500 companies site and has passed all their regression tests.

Hope that helps to get you started!