code: public static void removeAllJ2CIdentityServices() {
          j2cIdentityServices.clear();
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "All the J2CIdentityService implementations were removed.");
          }
      }
docs: Remove all the J2CIdentityService references. This method is called by
  ThreadIdentityManagerConfigurator when the J2CIdentityService service tracker is closed.