As a workaround, I added two source="1.5" attributes to <javac ...> elements, one each in java/resolver.xml and java/which.xml.
I'd submit a patch to rename the variables to a more suitable name, but I'm walking my first steps in the whole Java world; I'd rather let others do it. [PS: mind CC'ing me? I'm hardly pressed to find the time to keep up with existing subscriptions; I'd prefer not have to subscribe to this one too] Thanks, -- Luis Bruno
