Description of problem:

It's not possible to perform any task operation because the user is supposed to be an anonymous, so he doesn't have any permissions to do the operation. It shouldn't be even possible to do an operation without being logged since the REST API is fully secured.
I just create the ClientRequestFactory with UserNamePasswordCreadentials and then do the rest/task/taskid/start operation.
It seems that the IdentityProvider doesn't return logged user. https://github.com/droolsjbpm/droolsjbpm-integration/blob/master/kie-remote/kie-services-remote/src/main/java/org/kie/services/remote/rest/TaskResource.java

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