openjdk-jfx
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javafxports
Java applications using JavaFX WebView eventually freeze
We are running into a very nasty issue: Java application either Swing or pure JavaFX that use the WebView eventually freeze. This happens randomly, but this occurs always. Impossible to leave an application with WebView running during a long time.
It occurs with Java 8 on Win10 (we cannot use the other versions or platforms):
- Oracle JRE 1.8 271
- zulu8.50.0.53-ca-fx-jre8.0.275-win_x64
To reproduce, compile the app below, browse pages, switch between applications and leave it running in the background. It will eventually freeze (can be a few minutes, or hours or days), but it will freeze. No memory issue AFAIK.
package org.test.webview;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
public class WebViewApp extends Application {
private Scene scene;
@Override
public void start(Stage stage) {
// create the scene
stage.setTitle("Web View");
scene = new Scene(new FxBrowser(), 750, 500, Color.web("#666970"));
stage.setScene(scene);
scene.getStylesheets().add("webviewsample/BrowserToolbar.css");
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
class FxBrowser extends Region {
final WebView browser = new WebView();
final WebEngine webEngine = browser.getEngine();
public FxBrowser() {
//apply the styles
getStyleClass().add("browser");
// load the web page
webEngine.load("http://172.20.185.184:3000");
//add the web view to the scene
getChildren().add(browser);
}
private Node createSpacer() {
Region spacer = new Region();
HBox.setHgrow(spacer, Priority.ALWAYS);
return spacer;
}
@Override
protected void layoutChildren() {
double w = getWidth();
double h = getHeight();
layoutInArea(browser, 0, 0, w, h, 0, HPos.CENTER, VPos.CENTER);
}
@Override
protected double computePrefWidth(double height) {
return 750;
}
@Override
protected double computePrefHeight(double width) {
return 500;
}
}
Once frozen, we forced a win dump with WinDbg and inspected the dump:
0:000> !locks
CritSec ntdll!LdrpLoaderLock+0 at 00007ff89a31f4f8
WaiterWoken No
LockCount 1
RecursionCount 1
OwningThread 2d14
EntryCount 0
ContentionCount 1
*** Locked
Scanned 18 critical sections
0:000> !cs -l
-----------------------------------------
DebugInfo = 0x00007ff89a31f978
Critical section = 0x00007ff89a31f4f8 (ntdll!LdrpLoaderLock+0x0)
LOCKED
LockCount = 0x1
WaiterWoken = No
OwningThread = 0x0000000000002d14
RecursionCount = 0x1
LockSemaphore = 0xFFFFFFFF
SpinCount = 0x0000000004000000
0:000> ~
. 0 Id: 29a8.416c Suspend: 0 Teb: 00000000`0092f000 Unfrozen
1 Id: 29a8.1258 Suspend: 0 Teb: 00000000`00937000 Unfrozen
2 Id: 29a8.3b8c Suspend: 0 Teb: 00000000`00939000 Unfrozen
3 Id: 29a8.3598 Suspend: 0 Teb: 00000000`0093b000 Unfrozen
4 Id: 29a8.41e0 Suspend: 0 Teb: 00000000`0093d000 Unfrozen
5 Id: 29a8.4270 Suspend: 0 Teb: 00000000`0093f000 Unfrozen
6 Id: 29a8.3e38 Suspend: 0 Teb: 00000000`00941000 Unfrozen
7 Id: 29a8.2f4c Suspend: 0 Teb: 00000000`00943000 Unfrozen
8 Id: 29a8.3aa4 Suspend: 0 Teb: 00000000`00945000 Unfrozen
9 Id: 29a8.1874 Suspend: 0 Teb: 00000000`00947000 Unfrozen
10 Id: 29a8.4354 Suspend: 0 Teb: 00000000`00949000 Unfrozen
11 Id: 29a8.9ec Suspend: 0 Teb: 00000000`0094b000 Unfrozen
12 Id: 29a8.3f8c Suspend: 0 Teb: 00000000`0094d000 Unfrozen
13 Id: 29a8.2874 Suspend: 0 Teb: 00000000`0094f000 Unfrozen
14 Id: 29a8.1184 Suspend: 0 Teb: 00000000`00951000 Unfrozen
15 Id: 29a8.2e84 Suspend: 0 Teb: 00000000`00953000 Unfrozen
16 Id: 29a8.dcc Suspend: 0 Teb: 00000000`00955000 Unfrozen
17 Id: 29a8.3f48 Suspend: 0 Teb: 00000000`00957000 Unfrozen
18 Id: 29a8.1df0 Suspend: 0 Teb: 00000000`00959000 Unfrozen
19 Id: 29a8.42e4 Suspend: 0 Teb: 00000000`0095b000 Unfrozen
20 Id: 29a8.2c60 Suspend: 0 Teb: 00000000`0095d000 Unfrozen
21 Id: 29a8.3724 Suspend: 0 Teb: 00000000`0095f000 Unfrozen
22 Id: 29a8.1fd0 Suspend: 0 Teb: 00000000`00961000 Unfrozen
23 Id: 29a8.4178 Suspend: 0 Teb: 00000000`00963000 Unfrozen
24 Id: 29a8.37f8 Suspend: 0 Teb: 00000000`00965000 Unfrozen
25 Id: 29a8.2984 Suspend: 0 Teb: 00000000`00967000 Unfrozen
26 Id: 29a8.3d48 Suspend: 0 Teb: 00000000`00969000 Unfrozen
27 Id: 29a8.432c Suspend: 0 Teb: 00000000`00973000 Unfrozen
28 Id: 29a8.a2c Suspend: 0 Teb: 00000000`00975000 Unfrozen
29 Id: 29a8.3aac Suspend: 0 Teb: 00000000`00977000 Unfrozen
30 Id: 29a8.3b24 Suspend: 0 Teb: 00000000`00979000 Unfrozen
31 Id: 29a8.3088 Suspend: 0 Teb: 00000000`0097b000 Unfrozen
32 Id: 29a8.2e30 Suspend: 0 Teb: 00000000`0097f000 Unfrozen
33 Id: 29a8.4208 Suspend: 0 Teb: 00000000`00989000 Unfrozen
34 Id: 29a8.1e80 Suspend: 0 Teb: 00000000`0098b000 Unfrozen
35 Id: 29a8.4014 Suspend: 0 Teb: 00000000`0098f000 Unfrozen
36 Id: 29a8.2970 Suspend: 0 Teb: 00000000`00991000 Unfrozen
37 Id: 29a8.42d4 Suspend: 0 Teb: 00000000`00993000 Unfrozen
38 Id: 29a8.3414 Suspend: 0 Teb: 00000000`00995000 Unfrozen
39 Id: 29a8.b50 Suspend: 0 Teb: 00000000`009a5000 Unfrozen
40 Id: 29a8.3c1c Suspend: 0 Teb: 00000000`009a7000 Unfrozen
41 Id: 29a8.b8c Suspend: 0 Teb: 00000000`009a9000 Unfrozen
42 Id: 29a8.b24 Suspend: 0 Teb: 00000000`009ab000 Unfrozen
43 Id: 29a8.3b54 Suspend: 0 Teb: 00000000`009ad000 Unfrozen
44 Id: 29a8.4300 Suspend: 0 Teb: 00000000`009af000 Unfrozen
45 Id: 29a8.6c0 Suspend: 0 Teb: 00000000`009b3000 Unfrozen
46 Id: 29a8.4374 Suspend: 0 Teb: 00000000`009b5000 Unfrozen
47 Id: 29a8.41f8 Suspend: 0 Teb: 00000000`009cd000 Unfrozen
48 Id: 29a8.3528 Suspend: 0 Teb: 00000000`009db000 Unfrozen
49 Id: 29a8.3d88 Suspend: 0 Teb: 00000000`009f3000 Unfrozen
50 Id: 29a8.38a4 Suspend: 0 Teb: 00000000`009a1000 Unfrozen
51 Id: 29a8.4274 Suspend: 0 Teb: 00000000`0084a000 Unfrozen
52 Id: 29a8.4058 Suspend: 0 Teb: 00000000`00870000 Unfrozen
53 Id: 29a8.1c80 Suspend: 0 Teb: 00000000`00820000 Unfrozen
54 Id: 29a8.14f0 Suspend: 0 Teb: 00000000`00822000 Unfrozen
55 Id: 29a8.4324 Suspend: 0 Teb: 00000000`00824000 Unfrozen
56 Id: 29a8.2810 Suspend: 0 Teb: 00000000`00826000 Unfrozen
57 Id: 29a8.2d14 Suspend: 0 Teb: 00000000`00828000 Unfrozen
58 Id: 29a8.2d18 Suspend: 0 Teb: 00000000`0082a000 Unfrozen
59 Id: 29a8.34c4 Suspend: 0 Teb: 00000000`0089a000 Unfrozen
60 Id: 29a8.38b4 Suspend: 0 Teb: 00000000`0089e000 Unfrozen
61 Id: 29a8.43c4 Suspend: 0 Teb: 00000000`00983000 Unfrozen
62 Id: 29a8.415c Suspend: 0 Teb: 00000000`008d8000 Unfrozen
63 Id: 29a8.2308 Suspend: 0 Teb: 00000000`00812000 Unfrozen
64 Id: 29a8.3fd8 Suspend: 0 Teb: 00000000`00814000 Unfrozen
65 Id: 29a8.413c Suspend: 0 Teb: 00000000`00816000 Unfrozen
66 Id: 29a8.3ee4 Suspend: 0 Teb: 00000000`00818000 Unfrozen
67 Id: 29a8.2ddc Suspend: 0 Teb: 00000000`00872000 Unfrozen
68 Id: 29a8.3c0c Suspend: 0 Teb: 00000000`009f7000 Unfrozen
69 Id: 29a8.22c4 Suspend: 0 Teb: 00000000`0092a000 Unfrozen
70 Id: 29a8.30f4 Suspend: 0 Teb: 00000000`009d1000 Unfrozen
71 Id: 29a8.3660 Suspend: 0 Teb: 00000000`009d3000 Unfrozen
72 Id: 29a8.2cd0 Suspend: 0 Teb: 00000000`009d5000 Unfrozen
73 Id: 29a8.41a8 Suspend: 0 Teb: 00000000`009d7000 Unfrozen
74 Id: 29a8.1b6c Suspend: 0 Teb: 00000000`009d9000 Unfrozen
75 Id: 29a8.3a84 Suspend: 0 Teb: 00000000`009dd000 Unfrozen
76 Id: 29a8.2714 Suspend: 0 Teb: 00000000`009df000 Unfrozen
77 Id: 29a8.3988 Suspend: 0 Teb: 00000000`009e1000 Unfrozen
78 Id: 29a8.43b8 Suspend: 0 Teb: 00000000`009e3000 Unfrozen
79 Id: 29a8.2834 Suspend: 0 Teb: 00000000`009e5000 Unfrozen
80 Id: 29a8.3bfc Suspend: 0 Teb: 00000000`009e7000 Unfrozen
0:000> ~57 kv
# Child-SP RetAddr : Args to Child : Call Site
00 00000000`6aaff7c8 00007ff8`96b245c3 : 00000000`00000000 00000000`527001ea 00000000`00000030 00000000`00000030 : ntdll!NtWaitForSingleObject+0x14
01 00000000`6aaff7d0 00000000`528b3a8d : 00000000`3d7c9200 00000000`02ac4440 00000000`00000000 00000000`00000cd8 : KERNELBASE!WaitForSingleObjectEx+0x93
02 00000000`6aaff870 00000000`5282cd5b : 00000000`3d7c9200 00000000`02ac4440 00000000`3d87d800 00000000`00000000 : jvm!JVM_RaiseSignal+0x523d
03 00000000`6aaff8a0 00000000`5282d3b7 : 00000000`3d87d800 00000000`02ac4440 00000000`00000000 00007ff8`9a219860 : jvm!JVM_Sleep+0x7c88b
04 00000000`6aaff8d0 00000000`5276f785 : 00000000`00000000 00000000`3d87d800 00000000`00000001 00000000`6aaffa70 : jvm!JVM_Sleep+0x7cee7
05 00000000`6aaff900 00007ff8`3ed36377 : 00000000`5a938b28 00000000`00000001 00000000`00000001 60f632d9`00000003 : jvm!JNI_CreateJavaVM+0x205
06 00000000`6aaff9a0 00007ff8`3ed4937b : 00000000`5a938b28 00000000`00000001 7ff00000`00000000 00000000`6aaffa70 : jfxwebkit!WTF::isMainThread+0x57
07 00000000`6aaff9f0 00007ff8`3eee58fd : 00000000`00000001 00007ff8`9a1d267d 00000000`001d0000 00007ff8`711530de : jfxwebkit!WTF::Thread::create+0x29b
08 00000000`6aaffb30 00007ff8`3ee2d077 : 00000000`00000020 00000000`56efceb0 00000000`56efcea0 00000000`56efce70 : jfxwebkit!WTF::platformUserPreferredLanguages+0x15a95d
09 00000000`6aaffb60 00007ff8`9a208f07 : 00000000`7ffe0385 00000000`00000000 00000000`00000003 00000000`7ffe0384 : jfxwebkit!WTF::platformUserPreferredLanguages+0xa20d7
0a 00000000`6aaffb90 00007ff8`9a20903b : 00007ff8`3eee8a00 00007ff8`3d660000 00007ff8`00000003 00000000`00828000 : ntdll!LdrpCallInitRoutine+0x6f
0b 00000000`6aaffc00 00007ff8`9a2065b1 : 00000000`00828000 00000000`00828000 00007ff8`3eee8a00 00007ff8`3ee2d014 : ntdll!LdrpCallTlsInitializers+0x87
0c 00000000`6aaffc80 00007ff8`9a22a2be : 00000000`3d0b0d00 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!LdrShutdownThread+0x141
0d 00000000`6aaffd80 00007ff8`96b4772a : 00007ff8`3d660000 00000000`00000000 00000000`3d0b0d50 00000000`00000000 : ntdll!RtlExitUserThread+0x3e
0e 00000000`6aaffdc0 00007ff8`96ff04c4 : 00000000`5c6857b0 00000000`00000000 00000000`00000000 00000000`00000000 : KERNELBASE!FreeLibraryAndExitThread+0x4a
0f 00000000`6aaffdf0 00007ff8`96ff03c1 : 00000000`5c6857b0 00000000`5c6857b0 00000000`00000000 00000000`00000000 : ucrtbase!common_end_thread+0xa4
10 00000000`6aaffe20 00007ff8`99ad81f4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ucrtbase!thread_start<unsigned int (__cdecl*)(void * __ptr64)>+0x41
11 00000000`6aaffe50 00007ff8`9a22a251 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0x14
12 00000000`6aaffe80 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x21
Once the crash loaded, we looked for locks. It seems there was one in thread 2d14. We dumped the stack trace for it. It seems blocked somewhere in the jfxwebkit!WTF layers.
Without the Webview our applications with JavaFX run for ages without any issue.
@jmborer have you been able to solve or mitigate this issue? A customer of mine has a similar issue, actually, they use a webview and when I analyze the process dump file, I get to the very same thread and stacks as yours. Happens in Oracle JRE 1.8 241 for us; and might in others too. I should get at least two more windows process dump files next week. Beside that, would you share more information about the environment where that happens?
Hello,
Unfortunately, no. We had to use another solution. Even inactive pages with blank content lead to freezes. It was just a matter of time. The other dumps were not really interesting.
We use Win10. We had the issues with all Java 8 JVMs from Oracle and zulu (current to n-3).
We have switched to JxBrowser which is a better replacement even though you will need a license.
Hope it helps
Jm
Le 11 mars 2021 à 18:39, Marcel Lanz @.***> a écrit :
@jmborer have you been able to solve or mitigate this issue? A customer of mine has a similar issue, actually, they use a webview and when I analyze the process dump file, I get to the very same thread and stacks as yours. Happens in Oracle JRE 1.8 241 for us; and might in others too. I should get at least two more windows process dump files next week. Beside that, would you share more information about the environment where that happens?�
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It seems to me a similar problem was posted in the new JavaFX repository https://github.com/openjdk/jfx
Hello, Unfortunately, no. We had to use another solution. Even inactive pages with blank content lead to freezes. It was just a matter of time. The other dumps were not really interesting. We use Win10. We had the issues with all Java 8 JVMs from Oracle and zulu (current to n-3). We have switched to JxBrowser which is a better replacement even though you will need a license. Hope it helps Jm …
Thanks JM