A DESCRIPTION OF THE PROBLEM :
The use of websockets in linux currently results in a “java.lang.UnsatisfiedLinkError: 'void com.sun.webkit.network.SocketStreamHandle.twkDidOpen(long)” due to missing symbols in libjfxwebkit.so.
These symbols seem to be present in windows and MacOS, but they were removed in linux during the upgrade to Webkit 617.1.
(https://github.com/openjdk/jfx/commit/ba79e081547b7f15697bfaaac42ec2de1971935a)
Comparing the mapfile-vers with mapfile-macosx confirms the missing “SocketStreamHandle” symbols.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Try to establish a websocket communication on a linux device.
Minimal example to reproduce:
1. Java file "WebViewTest.java"
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
public class WebViewTest extends Application {
@Override
public void start(Stage stage) {
WebView webView = new WebView();
webView.getEngine().load(http://localhost:8000);
Scene scene = new Scene(webView, 800, 600);
stage.setScene(scene);
stage.setTitle("TEST");
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
2. “index.html” which shows an alert when connection establishes
<html>
<h1>Text Page</h1>
<button id='errorbutton' href="">Send ws data</button>
<script type="text/javascript">
var btn = document.getElementById('errorbutton');
btn.onclick = function () {
supportsWebSockets = 'WebSocket' in window || 'MozWebSocket' in window;
if (supportsWebSockets) {
console.log("WEBSOCKET SUPPORTED")
}
else {
console.log("WEBSOCKET NOT SUPPORTED")
}
const ws = new WebSocket('wss://echo.websocket.org/')
ws.onopen = () => {
console.log('ws opened on browser')
alert("[open] Connection established");
console.log(ws.readyState)
}
ws.onmessage = (message) => {
console.log(`message received`, message.data)
alert(message.data);
}
ws.onerror = (message) => {
console.log(`message received`, message.data)
}
console.log(ws.readyState)
}
</script>
<p id="p">test</p>
</html>
Running the example:
Host index.html to localhost:8000 (for example “python3 -m http.server”)
Run the WebviewTest.java with javafx-web dependency (17.0.13+)
Click the button on the page to create a websocket.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A popup occurring due to a websocket connection establishing.
ACTUAL -
No alert +
Exception in thread "JavaFX Application Thread" java.lang.UnsatisfiedLinkError: 'void com.sun.webkit.network.SocketStreamHandle.twkDidOpen(long)'
at javafx.web/com.sun.webkit.network.SocketStreamHandle.twkDidOpen(Native Method)
at javafx.web/com.sun.webkit.network.SocketStreamHandle.notifyDidOpen(SocketStreamHandle.java:361)
at javafx.web/com.sun.webkit.network.SocketStreamHandle.lambda$didOpen$3(SocketStreamHandle.java:330)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:290)
at java.base/java.lang.Thread.run(Thread.java:840)
Exception in thread "JavaFX Application Thread" java.lang.UnsatisfiedLinkError: 'void com.sun.webkit.network.SocketStreamHandle.twkDidClose(long)'
at javafx.web/com.sun.webkit.network.SocketStreamHandle.twkDidClose(Native Method)
at javafx.web/com.sun.webkit.network.SocketStreamHandle.notifyDidClose(SocketStreamHandle.java:383)
at javafx.web/com.sun.webkit.network.SocketStreamHandle.lambda$didClose$6(SocketStreamHandle.java:354)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:290)
at java.base/java.lang.Thread.run(Thread.java:840)
CUSTOMER SUBMITTED WORKAROUND :
Downgrading to 17.0.10