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I opened Services tab, Web Services -> Twitter -> Twitter OAuth -> [notifications] -> [follow] -> [{id}.{format}] -> followById and dragged it into my java file. Nothing happened although cursor moved in the code several lines down. Maybe some modules are missing. However there is no indication on what's wrong just nothing happens when I do drag and drop any of the web services.
This is not a bug. DnD works only for SOAP webservices in the described way. REST ws nodes are used in the IDE wizards. F.e. it is possible to generate RESTful Java client using IDE registered ( some node from Web Services node in the Services tab ).
DnD of a REST method from Services view into a .java file generates a call to this method by now => I am marking this issue as fixed.