Gnome-shell-system-monitor-applet: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?

[udovdh]

In the logging I found:

Apr 9 10:04:07 surfplank2 journal[58232]: JS WARNING: [/home/udo/.local/share/gnome-shell/extensions/[email protected]/extension.js 635]: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?
(many of these)

Can you please fix this?
(Fedora 31, git mesa, git xf86-video-amdgpu, kernel.org 5.6.2)

[jdstrand]

FYI, Ubuntu is seeing this as well: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-system-monitor/+bug/1870285

[scarf]

Getting this too on Debian testing, Gnome 3.34.2,
Weird because after upgrading from stable -> testing, the extension was still working. It was only when Gnome told me to update it that it stopped working. I tried installing older versions like for 3.32 and 3.30 but got the same error.

Apr 13 17:38:58 throne gnome-shell[1455]: [System monitor] applet init from /home/scar/.local/share/gnome-shell/extensions/[email protected]
Apr 13 17:38:58 throne gnome-shell[1455]: JS ERROR: Extension [email protected]: Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?#012SystemMonitor_TipItem@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:669:13#012tip_format@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:946:27#012SystemMonitor_Cpu@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:1241:14#012createCpus@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:1408:20#012enable@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:2341:26#012_callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:148:32#012loadExtension@resource:///org/gnome/shell/ui/extensionSystem.js:280:26#012_loadExtensions/<@resource:///org/gnome/shell/ui/extensionSystem.js:490:18#012collectFromDatadirs@resource:///org/gnome/shell/misc/fileUtils.js:27:17#012_loadExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:469:19#012_enableAllExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:499:18#012_sessionUpdated@resource:///org/gnome/shell/ui/extensionSystem.js:530:18#012init@resource:///org/gnome/shell/ui/extensionSystem.js:48:14#012_initializeUI@resource:///org/gnome/shell/ui/main.js:242:22#012start@resource:///org/gnome/shell/ui/main.js:138:5#012@<main>:1:47

[scarf]

Thanks to https://extensions.gnome.org/accounts/profile/Dario.Lesca try this version, it worked for me,

wget https://raw.githubusercontent.com/paradoxxxzero/gnome-shell-system-monitor-applet/fac6b7646346264bd75813a9d606dd5ba5152d6b/system-monitor%40paradoxxx.zero.gmail.com/extension.js -O ~/.local/share/gnome-shell/extensions/[email protected]/extension.js

Now just need to figure out what is happening in this version that isn't happening in newer versions

[udovdh]

I updated from git yesterday or so but I still saw the message.
So I updated from git again, restarted gnome-shell
And now we see:
Some code called array.toString() on a Uint8Array instance. Previously this would have interpreted the bytes of the array as a string, but that is nonstandard. In the future this will return the bytes as comma-separated digits. For the time being, the old behavior has been preserved, but please fix your code anyway to explicitly call ByteArray.toString(array).#012(Note that array.toString() may have been called implicitly.)#0120 cb() ["/home/udo/.local/share/gnome-shell/extensions/[email protected]/extension.js":1543]
Also:

Usage of object.actor is deprecated for PanelMenuButton#012get@resource:///org/gnome/shell/ui/environment.js:249:29#012enable@/home/udo/.local/share/gnome-shell/extensions/[email protected]/extension.js:2371:13#012_callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:148:13#012loadExtension@resource:///org/gnome/shell/ui/extensionSystem.js:280:21#012_loadExtensions/<@resource:///org/gnome/shell/ui/extensionSystem.js:490:13#012collectFromDatadirs@resource:///org/gnome/shell/misc/fileUtils.js:27:17#012_loadExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:469:9#012_enableAllExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:499:13#012_sessionUpdated@resource:///org/gnome/shell/ui/extensionSystem.js:530:13#012init@resource:///org/gnome/shell/ui/extensionSystem.js:48:9#012_initializeUI@resource:///org/gnome/shell/ui/main.js:242:5#012start@resource:///org/gnome/shell/ui/main.js:138:5#012@

:1:31

is this an effect of the fix?
We have this version of gnome-shell: gnome-shell-3.34.5-1.fc31.x86_64

[franglais125]

@udovdh what you are seeing seem like warnings (I have a couple as well). We need to fix them too. But is the extension working for you with the latest git?

[udovdh]

Extension was and is working!

[scarf]

git version still doesn't work for me, still getting the errors

Apr 15 00:18:12 throne gnome-shell[1455]: [System monitor] applet init from /home/scar/.local/share/gnome-shell/extensions/[email protected]
Apr 15 00:18:12 throne gnome-shell[1455]: JS ERROR: Extension [email protected]: Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?#012SystemMonitor_TipItem@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:669:13#012tip_format@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:946:27#012SystemMonitor_Cpu@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:1241:14#012createCpus@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:1408:20#012enable@/home/scar/.local/share/gnome-shell/extensions/[email protected]/extension.js:2341:26#012_callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:148:32#012loadExtension@resource:///org/gnome/shell/ui/extensionSystem.js:280:26#012_loadExtensions/<@resource:///org/gnome/shell/ui/extensionSystem.js:490:18#012collectFromDatadirs@resource:///org/gnome/shell/misc/fileUtils.js:27:17#012_loadExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:469:19#012_enableAllExtensions@resource:///org/gnome/shell/ui/extensionSystem.js:499:18#012_sessionUpdated@resource:///org/gnome/shell/ui/extensionSystem.js:530:18#012init@resource:///org/gnome/shell/ui/extensionSystem.js:48:14#012_initializeUI@resource:///org/gnome/shell/ui/main.js:242:22#012start@resource:///org/gnome/shell/ui/main.js:138:5#012@<main>:1:47

Only version that works for me is from fac6b7646346264bd75813a9d606dd5ba5152d6b above

[jeantil]

I updated to ubuntu 20.04 git GNOME 3.36.1 recently and I had the same error. The discussion on the merge request #564 mentioned issues with version 38, a quick check in ~/.local/share/gnome-shell/extensions/[email protected]/metadata.json showed I had version 39 installed
After restarting the laptop the extension showed up. (I think restarting gnome shell would have been enough)

[udovdh]

Found in my logs, running the git version:

May  6 05:08:54 bla journal[218300]: [System monitor] applet enabling
May  6 05:08:54 bla journal[218300]: JS WARNING: [/home/udo/.local/share/gnome-shell/extensions/[email protected]/extension.js 669]: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?

(multiple...)

[kakila]

Ubuntu 20.04

Jun 05 11:41:49 katara gnome-shell[2705]: JS ERROR: Extension [email protected]: Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?
                                          SystemMonitor_smDialog@/home/juanpi/.local/share/gnome-shell/extensions/[email protected]/extension.js:286:9
                                          enable@/home/juanpi/.local/share/gnome-shell/extensions/[email protected]/extension.js:2309:23

So far none of the workarounds seem to work

[kitingChris]

Debian GNOME Shell 3.34.4
Issue still exists :(

EDIT: After having a look in journalctl finding the stack trace:

Jun 08 09:22:08 araLap151 gnome-shell[2666]: JS ERROR: Extension [email protected]: Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?
                                             SystemMonitor_TipItem@/home/chris/.local/share/gnome-shell/extensions/[email protected]/extension.js:669:13
                                             tip_format@/home/chris/.local/share/gnome-shell/extensions/[email protected]/extension.js:946:27
                                             SystemMonitor_Cpu@/home/chris/.local/share/gnome-shell/extensions/[email protected]/extension.js:1241:14
                                             createCpus@/home/chris/.local/share/gnome-shell/extensions/[email protected]/extension.js:1408:20
                                             enable@/home/chris/.local/share/gnome-shell/extensions/[email protected]/extension.js:2341:26

I had a look in the mentioned js file.

if (shell_Version < '3.36') {
    TipItem = class SystemMonitor_TipItem extends PopupMenu.PopupBaseMenuItem {
        constructor() {
            super();
            // PopupMenu.PopupBaseMenuItem.prototype._init.call(this);
            this.actor.remove_style_class_name('popup-menu-item');
            this.actor.add_style_class_name('sm-tooltip-item');
        }
    }
} else {

And it looks like the GObject.registerClass() is also introduced in one of the minor versions of 3.34.

So for a quick and dirty workaround changing if (shell_Version < '3.36') to if (shell_Version < '3.34') helps.

Obviously this is not the best solution but I hope it helps to fix this issue.

Perhaps the if should ask if GObject has the method registerClass instead?

[kakila]

Interestingly, the issue in Ubuntu 20.04 shows in my desktop computer but not in my laptop, where it runs smoothly. Maybe it is a dependency issue? My laptop has been updated since 18.04, while my desktop is freshly installed.