docs: private void setUnauthenticatedSubjectIfNeeded() {
          if (LocationUtils.isServer()) {
              com.ibm.ws.security.context.SubjectManager sm = new com.ibm.ws.security.context.SubjectManager();
              Subject invokedSubject = sm.getInvocationSubject();
              if (invokedSubject == null) {
                  Subject callerSubject = sm.getCallerSubject();
                  if (callerSubject == null) {
                      // create the unauthenticated subject and set as the invocation subject
                      UnauthenticatedSubjectService unAuthenticationService = SecurityServices.getUnauthenticatedSubjectService();
                      if (unAuthenticationService != null) {
                          sm.setInvocationSubject(unAuthenticationService.getUnauthenticatedSubject());
                      }
                  }
              }
          }
      }