I have 5-buttons mouse, by default in Linux and Windows additional buttons actions in browser is back and forward. It works fine in Firefox but in JavaFx WebView I got NPE.

Code example:

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import javafx.embed.swt.FXCanvas;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;

public class SampleApp extends FXCanvas {
public SampleApp(Composite parent) {
super(parent, SWT.NONE);
WebView browser = new WebView();
this.setScene(new Scene(browser));
WebEngine webEngine = browser.getEngine();
webEngine.load("http://www.oracle.com");
}

public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());

SampleApp app = new SampleApp(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}

Stacktrace(two NPEs per one click):
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.scene.Scene$ClickCounter.access$7400(Scene.java:3321)
at javafx.scene.Scene$ClickGenerator.preProcess(Scene.java:3417)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3387)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3724)
at javafx.scene.Scene$MouseHandler.access$1800(Scene.java:3471)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1695)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2486)
at com.sun.javafx.tk.quantum.EmbeddedScene$2$1.run(EmbeddedScene.java:260)
at com.sun.javafx.tk.quantum.EmbeddedScene$2$1.run(EmbeddedScene.java:246)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.EmbeddedScene$2.run(EmbeddedScene.java:246)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2473)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3414)
at org.jboss.tools.vpe.browsersim.browser.javafx.SampleApp.main(SampleApp.java:35)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.scene.Scene$ClickCounter.access$7700(Scene.java:3321)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3452)
at javafx.scene.Scene$ClickGenerator.access$8300(Scene.java:3387)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3755)
at javafx.scene.Scene$MouseHandler.access$1800(Scene.java:3471)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1695)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2486)
at com.sun.javafx.tk.quantum.EmbeddedScene$2$1.run(EmbeddedScene.java:260)
at com.sun.javafx.tk.quantum.EmbeddedScene$2$1.run(EmbeddedScene.java:246)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.EmbeddedScene$2.run(EmbeddedScene.java:246)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2473)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3414)
at org.jboss.tools.vpe.browsersim.browser.javafx.SampleApp.main(SampleApp.java:35)