docs: private boolean setUnauthenticatedSubjectIfNeeded(Subject invokedSubject, Subject receivedSubject) {
          if ((invokedSubject == null) && (receivedSubject == null)) {
              // create the unauthenticated subject and set as the invocation subject
              SubjectManager sm = new SubjectManager();
              sm.setInvocationSubject(unauthenticatedSubjectService.getUnauthenticatedSubject());
              return true;
          }
          return false;
      }