Appengine java - Jersey/Jackson JaxbAnnotationIntrospector NoClassDefFoundError

Question

I\'m re-asking an unanswered question from the now read-only google groups App Engine for Java because I have the exact same problem. (original)

I have put together a si

Answer 1

From what I can tell you most likely don't have the optional XC Jackson lib.

The XC package allows you to use Xml Annotations (JAXB) in addition to the Jackson Annotations for mapping classes.

From what I can tell this error will only happen once during Jackson first setup so unless you need JAXB support just ignore the issue.