Java Programming

Hello,
I'm curerntly programming a Java application that reads barcodes as standard input (hopefully, barcodes are just transmitted to the computer as a keyboard input).

However, I just met a big problem : the user shouldn't have the right to press keys such as ctrl-alt-bksp or ctrl-tab, wich is a possibility if he owns the barcode reader manual (you can scan a barcode specifying to hold a key down).

Is there a way to get the keys and at the same time prevent such things to happen ?

Thanks for any help