mvn -Dimagej.app.directory=/home/me/Fiji.app install
for plugins that have a
<name>plugins/myPlugin.jar</name>
does not copy the target into
/home/me/Fiji.app/plugins
but into
/home/me/Fiji.app/jars
whereas
<name>plugins/my_Plugin.jar</name>
would be copied into
/home/me/Fiji.app/plugins
If I understood @Wayne correctly, _ is not required any more to recognize plugins. If that is true, it should not be required by the copy rule either.
requires _ in name