This chapter was all about the world of clustered applications. Here, we took you through
the robust clustering features of WildFly and applied them to some of the examples dis-
cussed in this topic.
The number of topics related to clustering might be expanded to cover a full book of its
own; however, we decided to stress only on some features. In particular, we learned how to
cluster EJBs and achieve fault tolerance in case there is a change in the server topology.
Next, we discussed clustering web applications and the integration with load balancing
solutions such as the Apache web server and mod_cluster .
In the next chapter, we will focus on some new topics added to Java EE 7 related to long-
term task execution: batch processing and concurrency utilities' usage.
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