Protocol Handlers Cannot Be Installed
Problem
You receive an error saying that "Protocol handlers could not be installed".
Cause
This is a possible error when using the WAR distribution of Oxygen XML Web Author because the WAR must be put in Tomcat and run with Java 17.
Solution
Add the following arguments to the JVM that runs Web
Author:
--add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED