`users` in `SystemWebSocketHandler` is always an empty list

[xiakunhou]

I write a scheduler task, and it calls sendMessageToUsers method to broadcast message to all users. But every time users list is empty and no one can get message.

[xiakunhou]

It seems that class SystemWebSocketHandler is got loadded twice. And one 'afterConnectionEstablished' is executed, the list is still empty from debug info