In this chapter, you've learned how to create a cluster with two Managed Servers, the procedure to migrate a Java EE Singleton to a Singleton Service, how to use WebLogic Server as a load balancer through the HttpClusterServlet component, how to set up and use Coherence*Web to scale out HTTP Sessions, and how to integrate your JPA entities with TopLink Grid. By doing all this, we were able to scale up a web application by leveraging several WebLogic services and functionalities. This content is very important for production systems and applications that want to provide high availability and high performance.

In the next chapter, we're going to see features of WebLogic that speed up the development process, how to monitor server resources by using a Representational State Transfer (REST) API and how to troubleshoot classpath problems using the Classloader Analysis Tool (CAT).