@Jörg: >> On 04/04/2012 11:04, korgen wrote: >> we updated Drools from 5.1.1 to 5.3.1 (as in 5.1.1 >> language level >> > 1.7 is not supported). Why would Drools 5.1.1. not be usable with Java 1.7? Byte code is supposed to be upward compatible. -W