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

Modern way of realizing enterprise systems

Now we will look at how enterprise software projects are being developed.

Following the approach of meeting the needs of real-world customers, we will face the question of the purpose of the application that we want to develop. The motivations and purposes of the enterprise systems need to be clear before immediately going into technology details. Otherwise, software is just being developed for the sake of developing software. Sadly, this is the case way too often. By focusing on business logic and the principles of Domain-Driven Design, as wonderfully described in the book by Eric Evans, we will ensure that the software we are building will meet the business demands.

Only after the application's purpose and responsibility is clear to the stakeholders, can we focus on the technological aspects. Teams should favor technologies that can not only implement the business use cases appropriately but also reduce the amount of work and overhead. Developers should be able to focus on the business, not the framework and technology. Good frameworks support solving business problems in a lean way and don't want the developer's attention themselves.

The chosen technology should also support productive development workflows as much as possible. This not only includes automation and fast development turnarounds but also the ability to embrace modern infrastructure, such as Linux containers. In Chapter 4, Lightweight Java EE, and Chapter 5, Container and Cloud Environments with Java EE, we will have a closer look into the nuts and bolts of modern environments and how Java EE supports them.