Jive Software included a jar file that adds Apache Ant selectors, which it used to have custom builds (by license / product edition). Now that Openfire is open source, that functionality is not used (I wonder if it was ever used by Jive in the first place).
As a side-effect, the ant modifications pull in a very old version of qdox, which has some quirks (the build process will fail if an enum definition does not end with a semicolon, for example).
Both files should be removed.
Fixed in the connectionmanagement-refactor branch.