B4J Question jWebSocketClient - cant connect

Alexander Stolte

Alexander Stolte

Expert
Licensed User
Longtime User
I get the following error message if i try to connect to "wss://b4x.com:51041/smiley/ws"
B4X: 
Waiting for debugger to connect...
Program started.
2023-10-11 09:54:11.167:INFO::JavaFX Application Thread: Logging initialized @3000ms to org.eclipse.jetty.util.log.StdErrLog
org.eclipse.jetty.websocket.api.UpgradeException: 0 null
    at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.onComplete(WebSocketUpgradeRequest.java:515)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:193)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:185)
    at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:464)
    at org.eclipse.jetty.client.HttpReceiver.abort(HttpReceiver.java:545)
    at org.eclipse.jetty.client.HttpReceiver.responseFailure(HttpReceiver.java:436)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.failAndClose(HttpReceiverOverHTTP.java:369)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.earlyEOF(HttpReceiverOverHTTP.java:338)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:1476)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.shutdown(HttpReceiverOverHTTP.java:209)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.process(HttpReceiverOverHTTP.java:147)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.receive(HttpReceiverOverHTTP.java:73)
    at org.eclipse.jetty.client.http.HttpChannelOverHTTP.receive(HttpChannelOverHTTP.java:133)
    at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onFillable(HttpConnectionOverHTTP.java:155)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
    at org.eclipse.jetty.io.ssl.SslConnection$2.run(SslConnection.java:136)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.io.EOFException: HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]<-DecryptedEndPoint@5d3de879{b4x.com/67.227.218.133:51041<->/192.168.188.20:54622,OPEN,fill=-,flush=-,to=4/0}->HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]->SocketChannelEndPoint@4d9b97eb{b4x.com/67.227.218.133:51041<->/192.168.188.20:54622,ISHUT,fill=-,flush=-,to=4/0}{io=0/0,kio=0,kro=1}->SslConnection@61f26ca7{NEED_WRAP,eio=-1/-1,di=-1}=>HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]
    ... 13 more
org.eclipse.jetty.websocket.api.UpgradeException: 0 null
    at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.onComplete(WebSocketUpgradeRequest.java:522)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:193)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:185)
    at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:464)
    at org.eclipse.jetty.client.HttpReceiver.abort(HttpReceiver.java:545)
    at org.eclipse.jetty.client.HttpReceiver.responseFailure(HttpReceiver.java:436)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.failAndClose(HttpReceiverOverHTTP.java:369)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.earlyEOF(HttpReceiverOverHTTP.java:338)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:1476)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.shutdown(HttpReceiverOverHTTP.java:209)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.process(HttpReceiverOverHTTP.java:147)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.receive(HttpReceiverOverHTTP.java:73)
    at org.eclipse.jetty.client.http.HttpChannelOverHTTP.receive(HttpChannelOverHTTP.java:133)
    at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onFillable(HttpConnectionOverHTTP.java:155)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
    at org.eclipse.jetty.io.ssl.SslConnection$2.run(SslConnection.java:136)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678)
    at java.base/java.lang.Thread.run(Thread.java:834)
java.util.concurrent.ExecutionException: org.eclipse.jetty.websocket.api.UpgradeException: 0 null
    at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395)
    at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1999)
    at anywhersoftware.b4j.objects.WebSocketClientWrapper.Close(WebSocketClientWrapper.java:102)
    at anywhersoftware.b4j.objects.WebSocketClientWrapper$WSHandler.onWebSocketError(WebSocketClientWrapper.java:163)
    at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onError(JettyListenerEventDriver.java:112)
    at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingError(AbstractEventDriver.java:96)
    at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.handleException(WebSocketUpgradeRequest.java:528)
    at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.onComplete(WebSocketUpgradeRequest.java:522)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:193)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:185)
    at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:464)
    at org.eclipse.jetty.client.HttpReceiver.abort(HttpReceiver.java:545)
    at org.eclipse.jetty.client.HttpReceiver.responseFailure(HttpReceiver.java:436)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.failAndClose(HttpReceiverOverHTTP.java:369)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.earlyEOF(HttpReceiverOverHTTP.java:338)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:1476)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.shutdown(HttpReceiverOverHTTP.java:209)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.process(HttpReceiverOverHTTP.java:147)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.receive(HttpReceiverOverHTTP.java:73)
    at org.eclipse.jetty.client.http.HttpChannelOverHTTP.receive(HttpChannelOverHTTP.java:133)
    at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onFillable(HttpConnectionOverHTTP.java:155)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
    at org.eclipse.jetty.io.ssl.SslConnection$2.run(SslConnection.java:136)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.eclipse.jetty.websocket.api.UpgradeException: 0 null
    at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.onComplete(WebSocketUpgradeRequest.java:515)
    ... 19 more
Caused by: java.io.EOFException: HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]<-DecryptedEndPoint@5d3de879{b4x.com/67.227.218.133:51041<->/192.168.188.20:54622,OPEN,fill=-,flush=-,to=4/0}->HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]->SocketChannelEndPoint@4d9b97eb{b4x.com/67.227.218.133:51041<->/192.168.188.20:54622,ISHUT,fill=-,flush=-,to=4/0}{io=0/0,kio=0,kro=1}->SslConnection@61f26ca7{NEED_WRAP,eio=-1/-1,di=-1}=>HttpConnectionOverHTTP@7a0e862d(l:/192.168.188.20:54622 <-> r:b4x.com/67.227.218.133:51041,closed=false)=>HttpChannelOverHTTP@edccf14(exchange=HttpExchange@21053c9d req=TERMINATED/null@null res=PENDING/null@null)[send=HttpSenderOverHTTP@75f3a03b(req=QUEUED,snd=COMPLETED,failure=null)[HttpGenerator@5bc0994c{s=START}],recv=HttpReceiverOverHTTP@330c594f(rsp=IDLE,failure=null)[HttpParser{s=CLOSED,0 of -1}]]
    ... 13 more
I have already found several threads with this problem, but without working solutions.

Web socket client SSL can't connect

I have a program that works fine with non secure link to server. When I try to connect to wss link the connection process lasts about 1 minute and then throws following: org.eclipse.jetty.websocket.api.UpgradeException: 0 null .... '''''''''''''''''''' ''''''''''''''''''' WebSocket Closed: 0...
www.b4x.com www.b4x.com

websocket error

Hello, I have a jar file created with b4j to connect to a remote server via websocket and get live updates of a price of stg. My jar randomlu crashes with this : Error:(ExecutionException) java.util.concurrent.ExecutionException: org.eclipse.jetty.websocket.api.UpgradeException: 0 null...
www.b4x.com www.b4x.com

Secure websocket connection won't connect at first attempt

Hello everyone. I'm having a problem getting a secure websocket connection (B4J client to B4J server) to connect consistently.... Based on the various examples in the forum, I've merged the Websocket Push framework with the SQLite version of jRDC2 created by @OliverA, and created a client B4J...
www.b4x.com www.b4x.com

Why Doesn't This Websocket Connect?

I think this should connect. I've tested the URL with an online websocket connection tester, and the connection works there. Private Sub StartWebsocket wsc.Initialize("wsc") wsc.Connect("wss://ws-feed.exchange.coinbase.com") Wait For wsc_Connected Log("Websocket connected!")...
www.b4x.com www.b4x.com

I'm using this code:
B4X: 
    Dim  ws As WebSocketClient
    ws.Initialize("ws")
    Dim ssl As JavaObject
    ssl.InitializeNewInstance("org.eclipse.jetty.util.ssl.SslContextFactory", Array(True))
    Dim jo As JavaObject = ws
    Dim wsc As JavaObject
    wsc.InitializeNewInstance("org.eclipse.jetty.websocket.client.WebSocketClient", Array(ssl))
    jo.SetField("wsc", wsc)
    Sleep(1000)
    ws.Connect("wss://b4x.com:51041/smiley/ws")
    Wait For ws_Connected
    Log("connected")
B4J Version: 10 Beta #2
jWebSocketClient Version: 1.13
Java Version: 11
 

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I see it too and it is probably related to B4X server configuration.

You can make a test by starting two instances of B4J.
1. Create a new server project and run it in release mode.
2. Create a new non-ui project:
Code: 
Sub Process_Globals
    Private client As WebSocketClient
End Sub

Sub AppStart (Args() As String)
    Start
    StartMessageLoop
End Sub

Private Sub Start
    client.Initialize("client")
    client.Connect("ws://127.0.0.1:51042/guessmynumber_ws/ws")
    Wait For client_Connected
    Log("connected")
End Sub

Private Sub client_Closed (Reason As String)
    Log("closed: " & Reason)
End Sub
It should connect.
 
Upvote 0
I don't think I ever tried java 8 when I encountered the problem described in the thread linked to in post #1 here.
I've tried it briefly now and with the test/example apps I attached back then, using java 8 the secure websocket connects first time every time I tried it!

So, for me:
java 8 & jServer3 = wss connects reliably
java 11+ & jServer3 = wss does not connect reliably but does eventually after a few retires
java 11+ & jServer4 = wss does not connect reliably but does eventually after a few retires.

As you say, @Alexander Stolte, it's strange!

Unfortunately I can't use java 8 in my case so I'm just dealing with the fact that it takes the secure websocket a few retries to connect.
I guess something changed between java 8 & 11 that we're missing. It would be lovely to know what it is, so if anyone figures it out please post the solution!
 
Last edited:
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