How to Install Java JDK 7 and Getting Started on Linux Ubuntu 12.04 Precise I386 Easy Visual-Guide

Hi! The Tutorial shows you Step-by-Step How to Install Oracle-Sun Java JDK 7 i586 on Ubuntu Linux 12.04 Precise Pangolin Unity 32-bit Desktop.

After Installing you will need to Use the update-alternatives Tool to Update your System Java to 1.7 JDK.

To the Article Bottom there is a Link for Quick Start with Java JDK 7 Development and also How to Install Java Web-Servers Tomcat 7 for Ubuntu.

And this Visual Guide includes the Basic Screenshots of All GUI Steps involved.

The Content give Focus Only to the Essentials Instructions and Commands to make it Easier to Follow.

1. Here Download Oracle Java SE JDK 7:

   JDK 7 i586.tar.gz
   Link to Download the Latest JDK Release

2. Double-Click on the tar.gz Archive and Extract into /tmp

3. Open a Terminal Window
   (Press “Enter” to Execute Commands)

4. Relocate JDK 7

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   sudo su

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

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   if [ ! -d "/usr/lib/jvm" ]; then mkdir /usr/lib/jvm; fi

   The above command is used to create a jvm directory if not already there.

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   sudo chown -R root:root /tmp/jdk1.7*

   Reiterate the Execution Permission over the Java binaries

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   chmod -R +x /tmp/jdk1.7*/bin

   Finally, Shift the Java contents with

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   mv /tmp/jdk1.7* /usr/lib/jvm/

5. Installing Oracle Java JDK 7

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   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7*/bin/java 1065

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   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7*/bin/javac 1065

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   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7*/bin/jar 1065

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   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7*/bin/javaws 1065

   Checking or Setting the System Java Version in Use with.

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   update-alternatives --config java

   And for the Java Compiler instead:

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   sudo update-alternatives --config javac

   To Switch of Java Version Just Enter the Reference Number on First, Column. :)

6. Optionally Set Java Environment Variable.

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   su <myUser>

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   nano $HOME/.bashrc

   Append:

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   export JAVA_HOME=/usr/lib/jvm/jdk1.<X.Y_uZ>

   Ctrl+x to Save & Exit from nano :)

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   source $HOME/.bashrc

7. How to Install Oracle Java Browser Plug-In:

   Here Install Oracle Java Firefox PlugIn

   How to Install Oracle Java JDK Firefox Plugin

Guides to Install the Tomcat 7 Java Server on Ubuntu Linux: