Windows

because I have no clue on how to do a rebase a new PR instead of  #370
Let's have a test for this validation, similar to here:
https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/model/jpa/src/test/java/org/jboss/aerogear/unifiedpush/jpa/InstallationDaoTest.java#L395-L429