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.
The thread you posted is quite old now, so I am moving this to a new thread.
Firstly you really need to get rid of all the scripting code from your JSP.
Next, at a glance, the exception you are getting looks like a data problem to me.