Why is my java Command Line Application Crashing with QT Error on R2022b?

I am compiling a Command Line application from a Java Library generated from my Simulink Model with Library Compiler in R2022b. When I try to run the app, it crashes with the following error message:

Assertion failed: (This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: cocoa, minimal, offscreen, webgl.

Note that this workflow works without issue on previous releases (R2021b, R2022a).

How can I resolve this issue?

Answer 1

[MathWorks Support Team]

As your application is a command line, you can explicitly disable QT from loading.

To do so, in the root folder of your project, locate the main "<project_name>.java" file used to compile the app.

In this file, in the definition of the class <project_name>, in the "main" method, add the following line:

 MWApplication.initialize(MWMCROption.NODISPLAY)

This will prevent QT from loading and solve the issue.

For more information about MWApplication, see:

https://www.mathworks.com/help/releases/R2022b/javabuilder/MWArrayAPI/com/mathworks/toolbox/javabuilder/MWApplication.html