@vicky_mac said in Memory leak in QML example project:

Is there anyway we can prevent that?

No, as already replied in your other thread asking exactly the same, which you have not referenced from this topic. But you can keep asking the same. Or, you can look through the source code, find the exact point of the leak you claim, and fix it.

Apologies, that was https://forum.qt.io/topic/152049/stackview-is-cause-of-memory-leak, you do not seem to be the same author, though they look similar.

I also notice you are using Qt 5.12. Qt Company is not going to be addressing anything in that version.

One possible alternative could be to use a Docker container to build your application with a suitably old Ubuntu or maybe a VM which would be even simpler,

Problem solved.
The issue was the default seat inside of the compositor was unset. Means the keymap attributes were emtpy. I have set it manually and now it works.

0948-0046-07-0A-TJ-0.jpeg

As suggested by @JKSH Simple sample code to handled the same

Window { width: 640 height: 480 visible: true title: qsTr("Hello World") Rectangle{ anchors.fill : parent color: "blue" radius : test.val1 } onClosing : { console.log("Window is closed") } }

@vicky_mac The old gstreamer versions have memory leaks. Which gstreamer version are you using? Try to upgrade to the latest gstreamer.
Your Qt is old as well. Upgrade your Qt to at least 5.15.2.

@JKSH Seems you were correct :

QML debugging is enabled. Only use this in a safe environment. Info: Starting QML Puppet ((null):0, (null)) Info: Could not load the Qt platform plugin "xcb" in "" even though it was found. ((null):0, (null)) Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: wayland, offscreen, minimal, wayland-egl, xcb, linuxfb, minimalegl, vnc, vkkhrdisplay, eglfs. ((null):0, (null))

ldd returns :

linux-vdso.so.1 (0x00007ffed5dfb000) libQt6XcbQpa.so.6 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f3bda977000) libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f3bda955000) libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f3bda90f000) libxcb-cursor.so.0 => not found libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f3bda908000) libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f3bda900000) libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f3bda8fb000) libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f3bda8e9000) libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f3bda8e2000) libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f3bda8dd000) libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f3bda8d4000) libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f3bda8c9000) libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f3bda8bb000) libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f3bda8b6000) libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f3bda898000) libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f3bda86e000) libQt6OpenGL.so.6 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f3bda7cc000) libQt6Gui.so.6 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f3bd9e00000) libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f3bd9d79000) libQt6Core.so.6 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f3bd9600000) libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f3bda7c5000) libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f3bd94c2000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f3bd9d72000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f3bd9d6d000) libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f3bd9200000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3bd9117000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f3bd9d49000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3bd8e00000) libxcb-cursor.so.0 => not found libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f3bd8cb9000) libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f3bd9d42000) libxcb-util.so.1 => /lib/x86_64-linux-gnu/libxcb-util.so.1 (0x00007f3bd9d39000) libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f3bd9d33000) libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f3bd9d29000) libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f3bd9d16000) libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f3bd9cc8000) libQt6DBus.so.6 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f3bd9051000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f3bd9caa000) libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f3bd8bef000) libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f3bd8b37000) libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f3bd9490000) libicui18n.so.56 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f3bd8600000) libicuuc.so.56 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f3bd8200000) libicudata.so.56 => /home/user/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f3bd6800000) librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f3bd9ca1000) /lib64/ld-linux-x86-64.so.2 (0x00007f3bdaa32000) libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f3bd8a9d000) libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f3bd9c8c000) libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f3bd9026000) libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f3bd67b2000) libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f3bd85c8000) libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x00007f3bd9483000) libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007f3bd9476000) libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f3bd66e2000) libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x00007f3bd66bf000) libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f3bd901a000) libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f3bd6577000) liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f3bd6545000) libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007f3bd6491000) liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f3bd646e000) libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f3bd6448000)

I installed libxcb-cursor and the problem is solved, thanks a lot !

@Richard-Buchmann I guess I put this issue in the wrong place. I send a bug report there : https://bugreports.qt.io/browse/QTBUG-116681

@Kamichanw Unfortunately, you can't. "ReferenceError: main is not defined"

@praveen_03 The code you have shared is correct. PErhapos it would be good to see the QML part, too ;-)

UPDATE: This is a known bug in Qt https://bugreports.qt.io/browse/QTBUG-113616

@Imman_Manny
it is gone in Qt6. You can check it out in the doc from here
https://doc.qt.io/qt-6/qmltypes.html
also read the following:
https://forum.qt.io/topic/132653/alternative-to-tabview-in-qt-6

@esvo
[PROBLEM SOLVED]
Turns out its a problem that is independent of windeployqt or qtcharts. Will be logging my findings here in case anyone else comes across this specific-ish issue as well. (Or if anyone has other insights)

The qml files with the charts being loaded in use singletons. I registered these singletons in the c++ main. When I registered the singletons I have the code looking into the working directory for the singleton qml files using the QDir::currentPath() function.

The folder including all the singletons must be included in the same folder as the exe for the app to have access to these files. Dropping the folder with the singleton qml files into the same folder as the exe fixes the problem.