Java developing does not need a high-powered, high spec system.
The basic Rs.28,990 Dell Inspiron 14R would meet your technical requirements.
If you do want to run any of the typical 3D games then you'll be looking closer to the top end of your budget range.
If portability, battery life and longevity are your major concerns I'd suggest one of the business class notebooks. Dell Vostro V131 13" Laptop Rs.38,990