解决方案：改为静态变量
private static PostingsHandlerOnlineServiceI postingsHandlerOnlineService; @Autowired public void setIAppChatService(PostingsHandlerOnlineServiceI serviceImpl) { PostingsHandlerOnlineController.postingsHandlerOnlineService = serviceImpl; }
SPRING中用websocket，无法实例化，注入bean为null
原文：https://www.cnblogs.com/jeanfear/p/14439484.html