title: "Unsupported major.minor version 51.0" while using mvn -v
body: <p>I changed java 7 to java 6 after that maven stoped work. I install java 6, changed all Environment variables, delete java.exe from system32 and even after that I get this "Unsupported major.minor version 51.0". I have to use java 6. How to fix maven?</p>