Fedora app start pauses on bean defs for DefaultExternalContentManager

I had copied a vm image running Fedora (note: the repository application, not the OS). The /data directory was pointing to NFS storage, so I made a duplicate of the other vm's directory for this new VM, and created a new blank MySQL database. I emptied out the data/resourceIndex directory, but forgot to also empty out the data/activemq directory. That caused the following mysterious problems:

The server/bin/fedora-rebuild.sh script was stalling just before loading the menu of options, and unable to continue, but not showing any errors.

If I tried starting up Fedora, server/log/fedora.log would pause at:
INFO 2012-02-14 14:51:55.210 [main] (Server) Loading bean definitions for org.fcrepo.server.storage.DefaultExternalContentManager

and tomcat/logs/catalina.out would pause at:
INFO: Deploying configuration descriptor fedora.xml

There were no actual errors.

So, note to self: when cloning a Fedora instance, you need to empty both the data/resourceIndex AND data/activemq instances.