Mark Barton has a must read blog entry on generating barcodes with XPages:

Due to the ability for an XPage to easily leverage Java code it is quite straightforward to integrate an existing Java library, so when the XPage is called a rendered barcode is returned.

For this demo I have decided to use a commercial library – the code will operate in a demo mode and is reasonably priced if you decide to buy it.  For this demo I am only interested in the Datamatrix barcode so I downloaded that specific Jar file from here.

Creating Barcodes with an XPage / Reading them with Flex >

[via Mark Myers]