Try this:
update-alternatives --install /usr/bin/javac javac /path/to/javac 2
update-alternatives --config javac
update-alternatives --install /usr/bin/java java /path/to/java 2
update-alternatives --config java
To verify:
java -version
Check out this link for more details.
http://www.linuxquestions.org/questions/linux-general-1/error-warning-the-javac-in-your-path-is-not-from-your-$java_home-enviroment-569131/
