docs: public synchronized void addSingletonInitialization(EJSHome home) {
          if (ivStopping) {
              throw new EJBStoppedException(home.getJ2EEName().toString());
          }
  
          if (ivSingletonInitializations == null) {
              ivSingletonInitializations = new LinkedHashSet<EJSHome>();
          }
          ivSingletonInitializations.add(home);
      }