How To Share a Tomcat Instance Between Oxygen XML WebApp And Another Application

Due to a class loader issue, the oXygen XML built-in protocol handlers cannot be used in a scenario where the WebApp shares the same Apache Tomcat instance with another application. To disable the protocol handlers initialization, set the com.oxygenxml.loadBuiltinProtocolHandlers option to false.

Also, the following issues need to be considered:

oXygen reads and sets system properties, and while we try to namespace oXygen-specific ones, there is no guarantee that there won't be any clashes with those set by other applications.
you have to adapt the JVM's memory configuration to the scenario where there will be more applications competing for the same pool of memory.
oXygen XML Author WebApp currently does not restart (or reload in Apache Tomcat terminology) correctly unless the Apache Tomcat server is also restarted.