Is this related to
Struts somehow? Or do I need to move it to a more appropriate forum?
That said, commons digester is used to parse XML. Struts uses it to parse the struts-config.xml file for example. With that in mind, most likely one of your config files is not valid in some way. Maybe you forgot to close an element or something, it's hard to say. Have a close look at your XML config files, starting with struts-config (assuming that this is in fact a Struts related issue).