In order to explore Java Persistence, we need to install and configure a database server, and MySQL is a logical choice, being widely adopted and lightweight.
The software is available to several operating systems: Microsoft Windows, Debian, SUSE Linux Enterprise Server, Red Hat, Solaris, Mac OS X, and so on.
If you are using a Linux distribution such as Ubuntu or Red Hat, most likely you already have the software available, you just need to install it with a command like this (you may want to update your repositories and packages to be sure that your system is up-to-date):
sudo apt-get install mysql-server mysql-client
The stable version at the time of writing is 5.5.27, but most likely ...