This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
I am setting request parameter as request.setAttribute("abc", "test123"); in calling servlet.
The same has to be read in called servlet.
That's not possible. Request attributes are a concept that's internal to a servlet engine - they're not part of an HTTP call that you make to some other URL. You'll need to use HTTP parameters instead. Using a library like Apache HttpClient for this is easier than using URLConnection directly.