Java EE 8 Microservices - Learn how the various components of Java EE 8 can be used to implement the microservice architecture.

Description

Build microservices-based enterprise applications with the latest version of Java EE. Key Features: * Create microservices in Spring and deploy them with Docker and Mesos * Examine a number of real-world use cases and hands-on code examples * Develop distributed applications based on microservices architecture Book Description: Cloud-based applications have been increasingly in demand, and this has caused a shift from monolithic to microservice applications. With the help of Java EE 8 Microservices, you'll get to grips with the components of Java EE 8 and understand how they are used to implement microservices. This book explains how a monolithic application is transformed into a microservice application, then helps you connect it in a traditional way and use advanced approaches for asynchronous communication. Once you have learned the basics, you'll explore advanced topics to make your microservices robust, scalable, and secure. Microservices form distributed applications, and by the end of this book you'll have discovered how to develop, pack, ship, and support distributed applications using Java EE. What you will learn: * Build microservices from the ground up with Java EE 8 * Implement and deploy microservices with Spring Boot * Develop reactive pipelines for asynchronous communication * Use caching mechanisms and JSON Web Token (JWT) to create scalable and secure microservices * Empower microservices with the Micro Profile effort and implement health checks, fault tolerance, and monitoring mechanisms * Use containers to build and deploy microservices * Create contract-first documentation with Swagger and API Blueprint Who this book is for: Java EE 8 Microservices is for Java EE developers keen to build microservice-based enterprise applications. Cover......Page 1 Title Page......Page 2 Copyright and Credits......Page 3 About Packt......Page 4 Contributors......Page 5 Table of Contents......Page 8 Preface......Page 12 What is Monolith design?......Page 17 The challenges associated with Monolith design......Page 19 Service-oriented architecture......Page 20 Understanding Microservices......Page 22 Advantages of Microservices......Page 25 Challenges with Microservices......Page 26 Summary......Page 27 Chapter 2: Creating your first Microservice......Page 28 Setting up the Development Environment......Page 29 Installing Java Development Kit......Page 30 Installing Apache Maven......Page 31 cURL......Page 32 Creating the project with Maven......Page 33 Your very first Microservice......Page 34 Coding the Microservice......Page 35 Configuring the Microservice......Page 38 Code summary......Page 39 Running the Microservice......Page 40 Building and running the Weather Microservice......Page 41 Invoking the Microservice......Page 42 Creating the project with Maven......Page 44 Coding a Spring Boot Microservice......Page 48 Building the Spring Boot Weather Microservice......Page 54 Running the Spring Boot Weather Microservice......Page 56 Summary......Page 58 Chapter 3: Connecting Microservices Together......Page 59 Building a client......Page 60 Using third-party reactive frameworks......Page 64 Connecting two Microservices together......Page 66 Creating and pooling web targets......Page 70 Running Snoop and registering our service......Page 71 Consuming registered services......Page 74 Installing Eureka Server......Page 75 Registering the service......Page 77 Discovering and invoking the service......Page 79 Summary......Page 80 Speeding up services with the Reactive API......Page 81 Collecting results of multiple parallel calls......Page 83 Completing a REST response asynchronously......Page 85 Specifying and handling asynchronous timeouts......Page 88 A complete reactive REST service......Page 89 Simplifying the code with a third-party reactive framework......Page 90 Building an asynchronous service......Page 92 Invoking the SSE service......Page 95 Invoking the SSE service from JavaScript......Page 97 Building an SSE Java client......Page 98 Automatically reconnecting of SSE clients......Page 101 Two-way asynchronous services with WebSocket......Page 103 A quick comparison between HTTP and WebSockets......Page 104 Decoupling services with message-oriented middleware......Page 105 An example of message-oriented middleware......Page 107 Summary......Page 110 Building for failure......Page 111 Isolating the failure......Page 112 The bulkhead pattern......Page 115 Stateless services......Page 116 The robustness principle......Page 117 Asynchronous communication......Page 118 Circuit breakers......Page 119 A circuit breaker code example......Page 123 Fan out and fastest response......Page 126 Preparing for failure......Page 127 Summary......Page 128 What is scalability?......Page 129 Stateless versus Stateful scalability......Page 131 Scaling on the cloud......Page 136 Going serverless with microservices......Page 138 Scaling databases with Microservices......Page 144 Scaling Microservices with caching......Page 149 Summary......Page 152 Anatomy of a JWT......Page 153 Java Security API – JSR 375......Page 155 Basic HTTP Authentication......Page 156 Custom form-based Authentication......Page 157 Built-in and Custom IdentityStores......Page 158 The security context API......Page 159 Spring Security with Spring-Boot-based Microservices......Page 160 Configuring Spring Security with the In-memory realm......Page 165 Configuring Spring Security with the database realm......Page 166 HTTPS – The Secured Protocol......Page 168 Summary......Page 169 What is monitoring and why is it required?......Page 170 Monitoring Microservices......Page 171 Understanding core concepts and terms......Page 173 Taking a closer look using an example......Page 174 Creating the example services......Page 175 Monitoring Microservices with Zipkin......Page 179 Case 1 – service is unresponsive......Page 182 Case 2 – service responding slowly......Page 184 Prometheus for monitoring and alerting......Page 186 Elasticsearch, Logstash, and Kibana (ELK)......Page 188 Considering more tools......Page 189 Summary......Page 190 Chapter 9: Building, Packaging, and Running Microservices......Page 191 Introduction to Java Packaging......Page 192 Understanding Archives......Page 193 FatJAR packaging......Page 195 OpenLiberty......Page 197 The OpenLiberty Maven plugin......Page 198 Configuring OpenLiberty......Page 200 The Weather Microservice with OpenLiberty......Page 202 The Gradle plugin......Page 204 The WildFly Swarm generator......Page 206 The WildFly Swarm Maven plugin......Page 207 HollowJAR......Page 212 Payara Micro......Page 213 The Payara Micro Maven plugin......Page 214 The Payara Micro UberJar......Page 217 The Deployment Architecture for Microservices......Page 218 Summary......Page 220 Chapter 10: Documenting and Testing MicroServices......Page 221 Documenting Microservices......Page 222 Swagger......Page 223 APIdoc......Page 229 Testing Microservices......Page 233 Unit testing......Page 234 Integration Testing......Page 237 Service Testing......Page 239 End-to-end testing......Page 240 Levels of Testing......Page 241 Summary......Page 243 Other Books You May Enjoy......Page 244 Index......Page 247