Getting started with XDM

Please check if Java is installed or not by typing: java -version in Terminal.
If not installed please follow the instructions in Installing Java section to install Java

Setting up XDM

• Create a folder named xdm in Home directory
• Copy xdm.jar and xdm into that directory
• Double click on xdm file to launch XDM
• Once XDM is launched, you can create application shortcut from
  XDM menu->File->Create application shortcut

Installing Java

Debian, Ubuntu, Linux Mint, Elementary OS etc.
On the command line, type:
sudo apt-get install openjdk-7-jre

Fedora, Oracle Linux, Red Hat Enterprise Linux, etc.
On the command line, type:
su -c "yum install java-1.7.0-openjdk"

Installing Java manually
Download Java from tar.gz file from: www.java.com
Extract the archive into some directory, say $HOME/JRE
Now create a symbolic link of that java executable in /bin directory,
To create symbolic link:

• Switch to /bin directory by typing cd /bin
• If you are using Fedora,Red Hat etc, then type su -c "ln -s '<path_to_java_executable>'" to create symbolic link.
• If you are using Ubuntu, Mint, Elementary OS etc, then type sudo ln -s "<path_to_java_executable>" to create symbolic link.