JDK-8089681 : WebView leaks memory when containing object acts as javascript callback handler
- Type: Bug
- Component: javafx
- Sub-Component: web
- Affected Version: 8,9
- Priority: P2
- Status: Resolved
- Resolution: Fixed
- Submitted: 2015-01-29
- Updated: 2020-02-24
- Resolved: 2016-03-11
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 8 | JDK 9 |
|---|---|
8u102Fixed  |
9Fixed |
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Sub Tasks
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JDK-8171401 :
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Description
I use a WebView that is contained in an extension of a Pane class (lets call it the view) and then use the view as the javascript callback handler. If I now close the application window without quiting (no implicit exit) the view and all of its memory is not reclaimed.
Here is some example code with a large long[] array that takes about 80MB of RAM so the leak is easy to spot in jvisualvm:
package bugreports;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Worker;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import netscape.javascript.JSObject;
public class WebEngineNotReleasingMemory extends Application
{
static final String html = "<!DOCTYPE html>" +
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-16\">" +
"<html>" +
"<button type=\"button\" onClick=\"javaCallback.sayWorld()\">Hello</button>" +
"</html>";
public static final class CallbackView extends BorderPane
{
private final long[] memoryWaster = new long[10000000];
private final WebView view = new WebView();
public CallbackView()
{
view.getEngine().getLoadWorker().stateProperty().addListener((ov, o, n) -> {
if (n == Worker.State.SUCCEEDED)
{
final JSObject window = (JSObject) view.getEngine().executeScript("window");
assert window != null;
window.setMember("javaCallback", this);
}
});
view.getEngine().loadContent(html);
setCenter(view);
}
// called from JavaScript
public void sayWorld()
{
System.out.println("World!");
}
}
@Override
public void start(final Stage primaryStage) throws Exception
{
Platform.setImplicitExit(false);
final CallbackView pane = new CallbackView();
primaryStage.setScene(new Scene(pane));
primaryStage.show();
}
}
How to reproduce:
1) Run the application
2) Close the window
3) Connect with jvisualvm to the application and force garbage collection, memory is not being reclaimed
Comments
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