My way of checking it was to list contents links to java through the following command..
> sudo update-alternatives --list java
I also verified the contents of the /usr/lib/jvm folder to make sure I had not missed configuring a previously installed JDK.
> ls /usr/lib/jvm
As you can see, I don't see a Sun JDK installed, and I need to start from the beginning.
First step was to go to Oracle site for downloading the latest JDK (http://www.oracle.com/technetwork/java/javase/overview/index.html). Follow the links to the latest version and download it to your local machine.
Next, I copied the downloaded JDK installation file from my Downloads folder to my local folder ~/Work/Servers/jdk , where I created the following script in a shell file called install-jdk1.8.sh.
#!/bin/sh
tar -xvf jdk-8*
sudo mkdir /usr/lib/jvm
sudo mv ./jdk1.8* /usr/lib/jvm/jdk1.8.0-oracle
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0-oracle/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0-oracle/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.0-oracle/bin/javaws" 1
sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws
Here is a syntax coloured screenshot of the script.
Next we make this script executable, and execute it.
> chmod a+x *.sh
>./install-jdk1.8.sh
Once the script has run, we can test the java version to confirm everything got setup correctly..
> java -version
If you see everything setup correctly, its great. If you still see an older version of JDK, use the update-alternatives command to set it up correctly by following these steps. Also, many softwares require an explicit JAVA_HOME to be set to execute correctly. This post on setting JAVA_HOME, shows how I have set it up on my machine.
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