I am searching for an open source hotel booking system, preferably written in Java.
closed as too broad by RockPaperLizard♦, Jan Doggen, Izzy♦, Tymric, Gilles May 19 '15 at 13:13
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Maybe someone will add system written in Java, but I'd like to show you there are such a systems available as plugins/extensions of popular CMS (content management system) platforms. They are not necessarily free, but they are open source (so you get source code after purchase)
Hopefully this shows you the idea.