With the update of Mojarra in JBoss EAP 8.0 Update 3 the response character encoding is broken.

Attached is a (pre-build using Java 17) reproducer application jsf-encoding-reproducer.zip.

Opening the application with http://localhost:8080/jsf-encoding shows a simple form, see:

After click here is pressed, the wrongly encoded output can be seen inside the browser, see:

This was working fine until JBoss EAP 8.0 Update 2.1.