Hi,
Further to my previous post, I have now found that my "working" idle notification actually breaks my application when built into production mode. If this component is present in my pom.xml then the production mode build causes the browser to hang when the app is accessed on its home URL. This is a real shame, this component would be so valuable and probably should be part of standard Vaadin (together with various other necessary enhancements to LoginForm for a really complete out of the box security solution...) I assume that there is an incompatibility between this component (developed against Vaadin 14) and the latest Vaadin 23 but my knowledge of JavaScript web components is not sufficient to debug the problem.
My build is Vaadin 23.0.7, Java 17 and SpringBoot 2.6.7