Set default java jdk
From Birnam Designs Wiki
To modify the default JDK to use in Linux, use the update-java-alternatives command.
To list the available options:
$ update-java-alternatives -l java-6-openjdk 1061 /usr/lib/jvm/java-6-openjdk java-6-sun 63 /usr/lib/jvm/java-6-sun java-gcj 1042 /usr/lib/jvm/java-gcj
To set the selected version:
sudo update-java-alternatives -s java-6-sun
