I am getting the same NPE. Does anyone have an answer for this?
If it helps, the ant output just before the exception is:
[generatewadl] Apr 2, 2013 2:27:58 PM
com.sun.jersey.api.core.ClasspathResourceConfig init
[generatewadl] INFO: Scanning for root resource and provider classes in
the paths:
[generatewadl] C:\workspace\dist\mywebapp\WEB-INF\classes
[generatewadl] C:\workspace\dist\mywebapp\lib\asm-3.3.1.jar
[generatewadl] C:\workspace\dist\mywebapp\lib\jersey-bundle-1.16.jar
[generatewadl] C:\workspace\dist\mywebapp\lib\servlet-api.jar
[generatewadl] Apr 2, 2013 2:27:58 PM
com.sun.jersey.api.core.ScanningResourceConfig logClasses
[generatewadl] INFO: Root resource classes found:
[generatewadl] class com.example.mywebapp.resources.VersionResource
[generatewadl] class com.example.mywebapp.resources.JobsResource
[generatewadl] class com.example.mywebapp.resources.UsersResource
[generatewadl] class com.example.mywebapp.resources.GroupsResource
[generatewadl] class com.example.mywebapp.resources.TemplatesResource
[generatewadl] class com.example.mywebapp.resources.AuthResource
[generatewadl] Apr 2, 2013 2:27:58 PM
com.sun.jersey.api.core.ScanningResourceConfig init
[generatewadl] INFO: No provider classes found.