I\'m writing a Java servlet in Eclipse (to be hosted on Google App Engine) and need to process an XML document. What libraries are available that are easy to add to an Eclip
Depends what your goals are I suppose. I've used JAXB for marshalling/unmarshalling xml to Java objects and it's fairly quick, easily extensible and has good community support.
If you don't want to get into writing schemas and what not then I've had good luck with dom4j and it has a smaller learning curve.
you can use exactly the same libraries you use in a non-servlet environment.