You may not have to, depending on the server. Many servlet containers offer a "hot-deploy" feature that will load the newer servlets/classes when they are added. Check your server's documentation.
Also, please don't flag your question as urgent (or "immediate"), even if it is for you. Claiming urgency is very likely to be counter-productive: most forum regulars will simply ignore such messages as rude and selfish attempts to elicit immediate and special attention.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
subject: please can you clear my doubt?(immediately)