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Installing Java on Ubuntu

 Recently I wanted to test Ant Commander on Linux. So I decided to install Ubuntu 12.04 in Virtual Box. Java doesn't seem to work out of the box, at least for applets. So I installed Oracle Java JRE for Linux.

The instructions on Oracle failed on my computer (rpm command failed to find some binaries needed for the installation) so I had to figure out how to install it.
Here are the instructions so you don't have to search for them. The instruction sudo passwd root is only if you don't have a root password yet.

Go to http://java.com/en/download/linux_manual.jsp
Download the Linux RPM version.
Then

sudo passwd root

su

cd /usr

mkdir java

cd java

mv /home/#username#/Downloads/jre-7u9-linux-i586.rpm .

apt-get install alien

alien jre-7u9-linuxi586.rpm

dpkg -i jre_1.7.009-1_i386.deb

cd /usr/lib/firefox-addons/plugins/

ln -s /usr/java/jre1.7.0_09/lib/i386/libnpjp2.so .

You may also to open the Text Editor (Ubuntu -> Text Editor)
Open -> Type a file name icon (on the top left corner) -> .bashrc (from your home directory)
Add this line at the end

PATH=/usr/java/jre1.7.0_09/bin:$PATH

And save the file

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