code: void updateCacheId(BackedSession backedSess) {
          if (com.ibm.websphere.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_WAS.isLoggable(Level.FINER)) {
              LoggingUtil.SESSION_LOGGER_WAS.entering(methodClassName, methodNames[UPDATE_CACHE_ID]);
          }
  
          backedSess.getStoreCallback().sessionAffinityBroke(backedSess);
  
          int i = backedSess.getVersion();
          // if at all 9's, reset
          if (i == 9999) {
              backedSess.setVersion(BackedSession.initialCacheId);
          } else {
              i++;
              backedSess.setVersion(i);
          }
          if (com.ibm.websphere.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_WAS.isLoggable(Level.FINER)) {
              LoggingUtil.SESSION_LOGGER_WAS.exiting(methodClassName, methodNames[UPDATE_CACHE_ID]);
          }
      }
docs: /*
  updateCacheId