1. Download jdk 6 from Orcal. [link]
2. Extract JDK.
chmod +x jdk-6u32-linux-x64.bin
sudo ./jdk-6u32-linux-x64.bin
sudo mkdir -p /opt/lib/jvm/
sudo mv jdk1.6.0_32/ /opt/lib/jvm/
3. Install Oracle Java to System.sudo update-alternatives --install "/usr/bin/java" "java" \
"/opt/lib/jvm/jdk1.6.0_32/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" \
"/opt/lib/jvm/jdk1.6.0_32/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" \
"/opt/lib/jvm/jdk1.6.0_32/bin/javaws" 1
4. Alternative to Oracle Java
sudo update-alternatives --config java
sudo update-alternatives --config javac
sudo update-alternatives --config javaws
If you haven’t openjdk installed, you can skip the step 4.