In previous versions, after you run an Ant build, you can get the admin-jsp source files in \openfire_src\work\jspc\java\org\jivesoftware\openfire\admin\setup.
I have figured it out myself.
in xmppserver/pom.xml, find the jetty-jspc-maven-plugin, add and configuration item of “keepSources” and set it to “true”.
Then you can find the compiled java files in the classes directory, along with the class files:
This is a good point. I’ve incorporated this in to the main code base at https://github.com/igniterealtime/Openfire/pull/1274
Glad to hear that. Thanks Greg!