Hello, As you probably know oVirt Engine 4 will use WildFly 10, and that requires Java 8. The version of WildFly that we currently use is 8.2.1, and it can work with both Java 7 and Java 8. In order to ease the transition I'm about to merge the following patch, that will require Java 8 during runtime: core: Require Java 8 during runtime https://gerrit.ovirt.org/46872 The implication of this for you is that you must make sure that you have Java 8 installed in the machine where you run your the engine. Fedora 22 only supports Java 8, so that isn't a problem. EL6 supports both Java 7 and Java 8, so make sure that you have Java 8 installed: yum -y install java-1.8.0-openjdk-devel If you have objections please speak now, otherwise I will merge the patch tomorrow. Regards, Juan Hernandez -- Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta 3ºD, 28016 Madrid, Spain Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.