Is this a servlet question or a general java one? If it is general java, you should post it in the appropriate forum. If it has something to do with servlets, I am having trouble understanding your question. What field? An attribute? A parameter? Please be more specific so we can help.
“Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.” - Rich Cook