I want to know good server side validation approach for
validating the user entered data against the data in the database. For
example i am writing an application to transfer money from user
account to some account. Now when the user enters certain amount to
transfer the money to other account, i want to perform server side
validation to verify whether user has sufficient balance to execute
the money transfer. I want to know is there any pluggable validation
framework to perform such server side validation.