eclipse set source level

Question

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?

Answer 1

In project properties->Java Build Path/Libraries tab make sure you have JRE System Library 6 ennvironment

Answer 2

In addition to source compability also set "compiler compliance level" and "generated .class files compatibility" in your project settings.