add @Override

ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysUserOnlineServiceImpl.java

@@ -115,6 +115,7 @@ public class SysUserOnlineServiceImpl implements ISysUserOnlineService
      * @param loginName 登录名称
      * @param sessionId 会话ID
      */
+    @Override
     public void removeUserCache(String loginName, String sessionId)
     {
         Cache<String, Deque<Serializable>> cache = ehCacheManager.getCache(ShiroConstants.SYS_USERCACHE);