title: eclipse set source level
body: <p>I have a project that I built for jdk 7, but I want to expand its compatibility for jdk 6 users as well. I have set the compiler compilance level to 1.6, but the project compiles normally, and fails running on a 1.6 jre due to the fact that the method revalidate was not added to java until java 7. (and the compiler didn't give ANY warnings about this at all!) How can I set the source level to 1.6 as well? I could do this in netbeans, any way on how to do this in eclipse?  </p>