Book Image

Architecting Modern Java EE Applications

By : Sebastian Daschner
Book Image

Architecting Modern Java EE Applications

By: Sebastian Daschner

Overview of this book

Java EE 8 brings with it a load of features, mainly targeting newer architectures such as microservices, modernized security APIs, and cloud deployments. This book will teach you to design and develop modern, business-oriented applications using Java EE 8. It shows how to structure systems and applications, and how design patterns and Domain Driven Design aspects are realized in the age of Java EE 8. You will learn about the concepts and principles behind Java EE applications, and how to effect communication, persistence, technical and cross-cutting concerns, and asynchronous behavior. This book covers Continuous Delivery, DevOps, infrastructure-as-code, containers, container orchestration technologies, such as Docker and Kubernetes, and why and especially how Java EE fits into this world. It also covers the requirements behind containerized, zero-dependency applications and how modern Java EE application servers support these approaches. You will also learn about automated, fast, and reliable software tests, in different test levels, scopes, and test technologies. This book covers the prerequisites and challenges of distributed systems that lead to microservice, shared-nothing architectures. The challenges and solutions of consistency versus scalability will further lead us to event sourcing, event-driven architectures, and the CQRS principle. This book also includes the nuts and bolts of application performance as well as how to realize resilience, logging, monitoring and tracing in a modern enterprise world. Last but not least the demands of securing enterprise systems are covered. By the end, you will understand the ins and outs of Java EE so that you can make critical design decisions that not only live up to, but also surpass your clients' expectations.
Table of Contents (22 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback
Appendix: Links and further resources

Definition of test scopes

There are several test scopes and responsibilities to consider. The following will introduce the different scopes the rest of this chapter will cover.

Certain namings, such as integation tests, are used ambiguously in various enterprise projects. This sub-chapter defines consistent test scope names that are used for the rest of this book.

Unit tests

Unit tests verify the behavior of individual units of an application. A unit test usually represents a single class, in some cases a few interdependent classes.

Unit tests operate on code level. They are usually executed in the IDE during development as well as part of the build process before the application is packaged. Unit tests have the shortest execution time of all test scopes. They only execute limited functionality that can be instantiated easily on code level. Potential dependencies of the units are simulated using mocks or dummy classes.

Component tests

Component tests verify the behavior of a coherent component...