Hands-On Enterprise Java Microservices with Eclipse MicroProfile - Build and optimize your microservice architecture with Java

Description

An effective guide to designing, building, and deploying enterprise Java microservices with Eclipse MicroProfile Key Features Create cloud-native microservices with ease using this detailed guide Avoid vendor lock-in when implementing microservices using Eclipse MicroProfile Discover why MicroProfile is a great specification for building microservices in multi-cloud environments Book Description Eclipse MicroProfile has gained momentum in the industry as a multi-vendor, interoperable, community-driven specification. It is a major disruptor that allows organizations with large investments in enterprise Java to move to microservices without spending a lot on retraining their workforce. This book is based on MicroProfile 2.2, however, it will guide you in running your applications in MicroProfile 3.0. You'll start by understanding why microservices are important in the digital economy and how MicroProfile addresses the need for enterprise Java microservices. You'll learn about the subprojects that make up a MicroProfile, its value proposition to organizations and developers, and its processes and governance. As you advance, the book takes you through the capabilities and code examples of MicroProfile's subprojects - Config, Fault Tolerance, Health Check, JWT Propagation, Metrics, and OpenTracing. Finally, you'll be guided in developing a conference application using Eclipse MicroProfile, and explore possible scenarios of what's next in MicroProfile with Jakarta EE. By the end of this book, you'll have gained a clear understanding of Eclipse MicroProfile and its role in enterprise Java microservices. What you will learn Understand why microservices are important in the digital economy Analyze how MicroProfile addresses the need for enterprise Java microservices Test and secure your applications with Eclipse MicroProfile Get to grips with various MicroProfile capabilities such as OpenAPI and Typesafe REST Client Explore reactive programming with MicroProfile Stream and Messaging candidate APIs Discover and implement coding best practices using MicroProfile Who this book is for If you're a Java developer who wants to create enterprise microservices, this book is for you. Familiarity with Java EE and the concept of microservices will help you get the most out of this book. Table of Contents Introduction to Eclipse Microprofile Governance and Contributions MicroProfile Config and Fault Tolerance APIs/capabilities MicroProfile Health Check and JWT Propagation MicroProfile Metrics and Open Tracing APIs/capabilities MicroProfile OpenAPI and Typesafe REST Client Implementing and Developing Conference Application through Eclipse MicroProfile A Working Eclipse MicroProfile Code Sample Reactive Programming and Future Developments MicroProfile in Multi-cloud Environments About the Author Cesar Saavedra has been working in the IT industry since 1990 and holds a Master of Science degree in Computer Science and a Master of Business Administration. He has worked as a developer, consultant, technical seller, and technical marketer throughout his career. He currently does technical product marketing for Red Hat JBoss Enterprise Application Platform (EAP), Eclipse MicroProfile, OpenJDK, Quarkus and Jakarta EE. He also manages the technical marketing for the runtimes, integration, BPM and rules management portfolio, and works closely with engineering and product management on thought leadership. Cesar has authored white papers, eBooks, and blogposts, and has been a conference and webinar speaker presenting to customers and partners. Heiko W. Rupp is an open source enthusiast working for more than a decade at Red Hat in the area of middleware monitoring and management. In this role he has been project lead of the RHQ and Hawkular monitoring systems and has also been contributing to various other projects like Kiali. Currently he helps defining the next way of Java Microservices with his work on Eclipse MicroProfile. As such he is the spec lead of the Eclipse MicroProfile Metrics effort and also contributing to other specifications. Heiko has written the first German book about JBossAS and one of the first German books on EJB3. He lives with his family in Stuttgart, Germany. Jeff Mesnil is employed by Red Hat as a Senior Software Engineer and currently, works for JBoss, Red Hat's middleware division, on the WildFly and JBoss EAP application servers. He is a member of the core team in charge of developing the internals of the application servers and lead its messaging subsystem (which provides the JMS API). Previously, he contributed to the HornetQ messaging broker that was integrated into WildFly and EAP. He is a proponent of Open Source development and all the code he writes either professionally or privately is available under Open Source licenses, these days, it is mostly hosted on GitHub. He has a keen interest on messaging systems and wrote several Open Source libraries related to messaging. Pavol Loffay is Senior Software Engineer at Red Hat. Pavol is working on observability tools for microservice architectures. He is mostly involved in the tracing domain, where he is an active committer on the Jaeger and OpenTracing projects. He is also a member of the OpenTracing Specification Council (OTSC) and a lead for the MicroProfile-OpenTracing specification. He has authored many blog posts and presented at several conferences. In his free time, Pavol likes to climb mountains and ski steep slopes in the Alps. Antoine Sabot-Durand is a Java Champion who works for Red Hat where he leads the Java EE, now Jakarta EE CDI spec. He is also involved in various projects linked to the CDI ecosystem, MicroProfile, and Jakarta EE. He is also Member of Devoxx France committee. He lives in France with his wife and 3 kids. Scott Stark started in chemical engineering, got steered into parallel computers as part of his Ph.D. work, and then made software his career, starting with a stint in finance/wall street. He then got into open source with the fledgling JBoss company, working on the application server and Java EE. He has worked with microkernel efforts, IoT efforts, standards, Jakarta EE, Eclipse MicroProfile and Quarkus. He lives in the Pacific Northwest with his wife. 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 13 Section 1: MicroProfile in the Digital Economy......Page 18 Enterprise Java microservices......Page 19 Forces that fuel the digital economy......Page 21 Multi-speed IT......Page 22 Introducing Eclipse MicroProfile......Page 23 MicroProfile value proposition......Page 28 Summary......Page 29 Questions......Page 30 Current Eclipse MicroProfile governance......Page 31 Sandbox approach to open contribution......Page 34 Umbrella releases versus projects outside the umbrella......Page 35 A quick tour of MicroProfile Starter......Page 36 Summary......Page 43 Questions......Page 44 Section 2: MicroProfile's Current Capabilities......Page 45 Understanding Eclipse MicroProfile Config......Page 46 Reading configuration from the MicroProfile Config API......Page 47 The Config object......Page 48 The @ConfigProperty annotation......Page 49 Default ConfigSources......Page 50 Custom ConfigSources implementations......Page 51 Using converters for high-level configuration......Page 52 Automatic converters......Page 53 Custom converters......Page 54 Understanding Eclipse MicroProfile Fault Tolerance......Page 55 MicroProfile Fault Tolerance in action......Page 56 The @Retry policy......Page 57 The @Fallback policy......Page 58 The @Bulkhead policy......Page 59 Tolerance with MicroProfile config......Page 60 Questions......Page 61 Further reading......Page 62 Chapter 4: MicroProfile Health Check and JWT Propagation......Page 63 Understanding health checks and how MicroProfile handles them......Page 64 The Health Check protocol and wire format......Page 65 The Health Check Java API......Page 66 Human operators......Page 70 Using JSON Web Token Propagation in MicroProfile......Page 71 Recommendations for interoperability......Page 72 Required MP-JWT claims......Page 73 The high-level description of the MP-JWT API......Page 74 Sample code that uses MP-JWT......Page 76 Injection of JsonWebToken information......Page 77 Injection of JWT claim values......Page 78 Configuring authentication of JWTs......Page 80 Running the samples......Page 81 Summary......Page 87 Questions......Page 88 MicroProfile Metrics......Page 89 Metadata......Page 90 Retrieving metrics from the server......Page 91 Supplying application-specific metrics......Page 93 Gauges......Page 94 Histograms......Page 95 Server-wide tags......Page 96 Using Prometheus to retrieve metrics......Page 97 New in MP-Metrics 2.0......Page 99 Tagging......Page 100 MicroProfile OpenTracing......Page 101 OpenTracing project......Page 102 Configuration properties......Page 103 JAX-RS......Page 104 Explicit instrumentation......Page 105 Tracer injection......Page 106 Tracing with Jaeger......Page 107 Questions......Page 110 Introduction to MicroProfile OpenAPI and its capabilities......Page 111 Configuration......Page 112 Generating the OpenAPI document......Page 113 Usage examples......Page 114 Static OpenAPI files......Page 116 Using a filter for updates......Page 118 Introduction to the MicroProfile REST Client and its capabilities......Page 119 Defining the endpoint Interface......Page 120 MicroProfile REST Client programmatic API usage......Page 121 MicroProfile REST Client CDI usage......Page 122 MicroProfile Config integration......Page 123 Simplifying configuration keys......Page 124 Dealing with client headers......Page 125 Provider registration for advanced usage......Page 126 Feature registration......Page 127 Exception mapping......Page 128 Default exception mapping......Page 129 Async support......Page 130 Summary......Page 131 Questions......Page 132 Section 3: MicroProfile Implementations and Roadmap......Page 133 Chapter 7: MicroProfile Implementations, Quarkus, and Interoperability via the Conference Application......Page 134 Current MicroProfile implementations......Page 135 Thorntail......Page 136 Open Liberty......Page 138 Payara Micro......Page 139 Hammock......Page 140 KumuluzEE......Page 141 Helidon......Page 142 Generating sample code for the current implementations......Page 143 Quarkus......Page 144 How to quark a generated MicroProfile project......Page 146 MicroProfile interoperability – the conference application......Page 151 Summary......Page 153 Questions......Page 154 Section 4: A Working MicroProfile Example......Page 155 Technical requirements......Page 156 Sample architecture of a multiservice MicroProfile application......Page 157 The Docker shell commands......Page 158 The Svcs2 shell command......Page 160 The Config tab......Page 161 The Health tab......Page 163 The Metrics tab......Page 165 The OpenTracing tab......Page 167 The OpenAPI tab......Page 170 The KeyCloak tab......Page 174 The JWT tab......Page 177 The RestClient tab......Page 179 Questions......Page 184 Further reading......Page 185 Section 5: A Peek into the Future......Page 186 Chapter 9: Reactive Programming and Future Developments......Page 187 An overview of Reactive Messaging......Page 188 MicroProfile reactive messaging architecture......Page 189 Message shapes......Page 190 MicroProfile reactive messaging examples......Page 193 Projects outside the umbrella......Page 198 Long Running Actions......Page 199 Context Propagation......Page 200 Differences between GraphQL and REST......Page 202 MicroProfile Boost......Page 203 Eclipse MicroProfile and Jakarta EE......Page 204 Summary......Page 205 Further reading......Page 206 Chapter 10: Using MicroProfile in Multi-Cloud Environments......Page 207 Microservices versus cloud native versus container native......Page 208 What about 12-factor applications?......Page 210 What about serverless and FaaS?......Page 211 Cloud-native application development......Page 212 Developing and running MicroProfile applications across clouds......Page 215 Considerations when using MicroProfile in a hybrid cloud deployment......Page 216 Challenges when using MicroProfile OpenTracing in a multi-cloud deployment......Page 217 Fallback......Page 218 Conclusion......Page 219 Summary......Page 220 Questions......Page 221 Chapter 1......Page 222 Chapter 2......Page 224 Chapter 3......Page 226 Chapter 5......Page 227 Chapter 7......Page 228 Chapter 9......Page 231 Chapter 10......Page 232 Other Books You May Enjoy......Page 237 Index......Page 240