In this chapter, we looked at the following:

• An overview of Java EE.
• Application servers and containers and their types in Java EE.
• The Java EE architecture and what's new in Java EE 8.
• Various plugins that are useful when writing Java EE applications using Kotlin. These included the all-open compiler plugin, the no-arg compiler plugin, the Kotlin-spring compiler plugin, and the Kotlin-jpa plugin.
• How to create a servlet application using Kotlin.
• Enterprise Java beans and their different types.
• How to create an application with EJB and Kotlin and an example of bean validation.