Installing Oracle Java on Ubuntu

If you already have Ubuntu packages of JRE and/or JDK already installed, then you may leave them installed. However, you must uninstall IcedTea. The IcedTea project provides a harness to build the source code from using free software build tools and adds a number of features to the upstream OpenJDK codebase.

root@ubuntu:~# aptitude search icedtea
i A icedtea-6-jre-cacao - Alternative JVM for OpenJDK, using Cacao
i A icedtea-6-jre-jamvm - Alternative JVM for OpenJDK, using JamVM
i A icedtea-7-jre-jamvm - Alternative JVM for OpenJDK, using JamVM
i A icedtea-netx - NetX - implementation of the Java Network
i A icedtea-plugin - web browser plugin based on OpenJDK and Ic
v icedtea6-jre-cacao -
v icedtea6-jre-cacao -
v icedtea6-plugin -
i icedtea6-plugin - web browser plugin to execute Java applets
root@ubuntu:~# aptitude remove icedtea6-plugin icedtea-plugin icedtea-netx icedtea-7-jre-jamvm icedtea-6-jre-jamvm icedtea-6-jre-cacao

Download Java from Java’s website: For 64-bit you want Linux x64 (the file name ending with x64.bin). In this example we downloaded jre-6u31-linux-x64.bin.
Then make a directory for Oracle Java. Move the downloaded file into this new directory:

root@ubuntu:~# mkdir -p /opt/java
root@ubuntu:~# cd /opt/java
root@ubuntu:/opt/java# mv /home/username/downloads/jre-6u31-linux-x64.bin .

Execute the file downloaded:

root@ubuntu:/opt/java$ sh jre-6u31-linux-x64.bin

This will create the directory /opt/java/jre1.6.0_31 containing your new instance of Java. Its name will match the version of Java downloaded. You may now delete the downloaded Java installation file:

root@ubuntu:/opt/java$ rm jre-6u31-linux-x64.bin

Tell the system that there is a new instance of Java available:

root@ubuntu:/opt/java# update-alternatives --install "/usr/bin/java" "java" "/opt/java/jre1.6.0_31/bin/java" 1
update-alternatives: using /opt/java/jre1.6.0_31/bin/java to provide /usr/bin/java (java) in manual mode.

Tell the system to default to the new Java instance:

root@ubuntu:/opt/java# update-alternatives --set java /opt/java/jre1.6.0_31/bin/java

Verify your system is now using this instance of Java:

root@ubuntu:/# java -showversion
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)