What we want to make sure happens in our CI environment is if code is specified to compile with

-target 7

that it runs with a java 7 JRE (if it is available). That way we can detect problems with the wrong bootclasspath, etc. We’ll still have the option even if the default is ‘false’, but it will be a knob you have to turn in order to get what I consider to be the most desirable behavior.