Occures during usage of several doclet subtasks with same names belonging to different tasks. E.g. ejbdoclet/deploymentdescriptor wseedoclet/deploymentdescriptor.
Open ~/xdoclet-web-module-1.2.3.jar\META-INF\xdoclet.xml and modify the subtask 'service-endpoint' to 'web-service-endpoint' and the subtask 'deploymentddescriptor' to 'web-deploymentdescriptor'.
Open ~/xdoclet-wsee-module-1.2.3.jar\META-INF\xdoclet.xml and modify the subtask 'deploymentddescriptor' to 'wsee-deploymentdescriptor'.
Use respective 'web-service-endpoint' and 'web-deploymentdescriptor' as a subtask of webdoclet and 'wsee-deploymentdescriptor' in wseedoclet