At the time of writing this book, the application clustering configuration had not been finalized in all components. Although web applications and the persistence API is ready for clustering, some components (chiefly EJB 3 session beans) are still missing clustering capabilities.
With the help of the JBoss development team, we could, however, produce all the necessary information needed for configuring clustering in your applications. As this information might be subject to change, we suggest you check the AS 7.1 documentation at: https://docs.jboss.org/author/display/AS71/High+Availability+Guide.
Now, we will complete our journey through the clustering system, discussing: