SockJSHandler on server not sending message to client

[Z.A Jafari]

Hi there,

I am trying to implement Sockjs between my Angular and Vertx but for some reason when the socket is created the server is not sending a message to the client. I will appreciate any help.

In the browser console I get this error

core.js:6210 ERROR TypeError: Cannot read properties of undefined (reading 'registerHandler')
    at _eventBus.onopen (eventbus.service.ts:39:22)
    at self.sockJSConn.onopen (vertx-eventbus.js:139:29)
    at push.l6Lj.EventTarget.dispatchEvent (eventtarget.js:51:20)
    at push.SGzc.SockJS._open (main.js:322:10)
    at push.SGzc.SockJS._transportMessage (main.js:255:12)
    at push.raCH.EventEmitter.emit (setPrototypeOf.js:50:18)
    at WebSocketTransport.ws.onmessage [as __zone_symbol__ON_PROPERTYmessage] (websocket.js:35:10)
    at WebSocket.wrapFn (zone.js:803:43)
    at ZoneDelegate.invokeTask (zone.js:434:35)
    at Object.onInvokeTask (core.js:28578:33)