Book Image

Hands-On Cloud Development with WildFly

By : Tomasz Adamski
Book Image

Hands-On Cloud Development with WildFly

By: Tomasz Adamski

Overview of this book

The book starts by introducing you to WildFly Swarm—a tool that allows you to create runnable microservices from Java EE components. You’ll learn the basics of Swarm operation—creating microservices containing only the parts of enterprise runtime needed in a specific case. Later, you’ll learn how to configure and test those services. In order to deploy our services in the cloud, we’ll use OpenShift. You’ll get to know basic information on its architecture, features, and relationship to Docker and Kubernetes. Later, you’ll learn how to deploy and configure your services to run in the OpenShift cloud. In the last part of the book, you’ll see how to make your application production-ready. You’ll find out how to configure continuous integration for your services using Jenkins, make your application resistant to network failures using Hystrix, and how to secure them using Keycloak. By the end of the book, you’ll have a functional example application and will have practical knowledge of Java EE cloud development that can be used as a reference in your other projects.
Table of Contents (14 chapters)

Unreliable network

When you develop your services for distributed environments, you must take into consideration that invocations of the services will be performed over the network. As a result, the application must be prepared to deal with network failures, which will certainly happen.

This problem is further enhanced by the fact that a single misbehaving service can poison a large number of services. Let's take a look at the number of scenarios, that can make this possible.

Dependent services

In large distributed systems, each service would have a large number of dependencies on other services. It requires only one dependency to fail to make the service irresponsible. Also, a service will go down too, becoming unavailable...