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Install Oracle Java JDK 1.7 on Ubuntu 12.04(Precise)

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Install the JDK

This post assumes you have no one of the JDK product.
  • Download he 32bit or 64bit Linux "compressed binary file" - it has a ".tar.gz" file extension i.e. "[java-version]-i586.tar.gz" for 32bit and "[java-version]-x64.tar.gz" for 64bit
  • Uncompress it
    tar -xvf jdk-7u9-linux-i586.tar.gz (32bit)
    tar -xvf jdk-7u9-linux-x64.tar.gz (64bit)
JDK 7 package is extracted into ./jdk.1.7.0_09 directory. N.B. check carefully this folder name since Oracle seem to change this occasionally with each update.
  • Now move the JDK 7 directory to /usr/lib
sudo mkdir -p /usr/lib/jvm
sudo mv ./jdk.1.7.0_09 /usr/lib/jvm/jdk1.7.0
  • Now run
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1
  • Correct the permissions of the executables:
sudo chmod a+x /usr/bin/java 
sudo chmod a+x /usr/bin/javac 
sudo chmod a+x /usr/bin/javaws
N.B. remember - Java JDK has many more executables that you can similarly install as above. java,javac, javaws are probably the most frequently required.
  • Run
sudo update-alternatives --config java

Check the version of you new JDK 7 installation:
java -version
java version “1.7.0”
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode)
Repeat the above for:
sudo update-alternatives --config javac
sudo update-alternatives --config javaws
Enable mozilla firefox plugin:
32 bit:
ln -s /usr/lib/jvm/jdk1.7.0/jre/lib/i386/libnpjp2.so ~/.mozilla/plugins/

64 bit:
ln -s /usr/lib/jvm/jdk1.7.0/jre/lib/amd64/libnpjp2.so ~/.mozilla/plugins/
N.B. you can link the plugin (libnpjp2.so) to /usr/lib/firefox/plugins/ for a system wide installation
Depending on your configuration, you might need to update the apparmor profile for firefox (or other browsers) in /etc/apparmor.d/abstractions/ubuntu-browsers.d/java
# Replace the two lines:
#  /usr/lib/jvm/java-*-sun-1.*/jre/bin/java{,_vm} cx -> browser_java,
#  /usr/lib/jvm/java-*-sun-1.*/jre/lib/*/libnp*.so cx -> browser_java,
# with those (or adapt to your new jdk folder name)
/usr/lib/jvm/jdk*/jre/bin/java{,_vm} cx -> browser_java,
/usr/lib/jvm/jdk*/jre/lib/*/libnp*.so cx -> browser_java,
Then restart apparmor:
sudo /etc/init.d/apparmor restart

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