Java messaging system is the standard Java API for the messaging systems. Any JMS implementation should expose this Java API as an interface. JMS focuses on the messaging API and its underlying messaging framework can be provided by different JMS providers. 

There are different JMS implementations available, including OpenMQ, RabbitMQ, WebSphere MQ, and WildFly. We can choose any of these JMS providers for our application; we are going to use GlassFish, which is a reference implementation of the JMS specification and is open source.

Let's look at how to install the GlassFish server, which acts as a JMS provider. We will use GlassFish 5, which is the latest version of GlassFish at the time of writing this book.