This solves the following problem which was found on OpenBSD:
bundle:
[exec] Generating net.i2p.desktopgui.messages_ar ResourceBundle...
[exec] ERROR - msgfmt failed on locale/messages_ar.po, not updating translations
[exec] msgfmt: Java compiler not found, try installing gcj or set $JAVAC
[exec] msgfmt: compilation of Java class failed, please try --verbose or set $JAVAC
[exec] 9 translated messages.
In OpenBSD 5.4, neither java nor javac are in the PATH.