Beginning Spring Boot 2 : Applications and Microservices with the Spring Framework

Learn Spring Boot and how to build Java-based enterprise, web, and microservice applications with it. In this book, you'll see how to work with relational and NoSQL databases, build your first microservice, enterprise, or web application, and enhance that application with REST APIs. You'll also learn how to build reactive web applications using Spring Boot along with Spring Web Reactive. Then you’ll secure your Spring Boot-created application or service before testing and deploying it. After reading and learning with __Beginning Spring Boot 2__, you'll have the skills and techniques to start building your first Spring Boot applications and microservices with confidence to take the next steps in your career journey. **What You'll Learn** * Use Spring Boot autoconfiguration * Work with relational and NoSQL databases Build web applications with Spring Boot * Apply REST APIs using Spring Boot * Cre ate reactive web applications using Spring Web Reactive - Secure your Spring Boot applications or web services - Test and deploy your Spring Boot applications **Who This Book Is For** Experienced Java and Spring Framework developers who are new to the new Spring Boot micro-framework. Contents at a Glance 4 Contents 6 About the Author 14 About the Technical Reviewer 15 Acknowledgments 16 Introduction 17 Chapter 1: Introduction to Spring Boot 19 Overview of the Spring Framework 19 Spring Configuration Styles 20 Developing Web Application Using SpringMVC and JPA 21 A Quick Taste of Spring Boot 34 Easy Dependency Management 37 Autoconfiguration 37 Embedded Servlet Container Support 37 Summary 38 Chapter 2: Getting Started with Spring Boot 39 What Is Spring Boot? 39 Spring Boot Starters 39 Spring Boot Autoconfiguration 40 Elegant Configuration Management 40 Spring Boot Actuator 40 Easy-to-Use Embedded Servlet Container Support 40 Your First Spring Boot Application 41 Using Spring Initializr 41 Using the Spring Tool Suite 42 Using Intellij IDEA 43 Using NetBeans IDE 44 Exploring the Project 44 The Application Entry Point Class 49 Fat JAR Using the Spring Boot Maven Plugin 50 Spring Boot Using Gradle 50 Maven or Gradle? 51 Summary 51 Chapter 3: Spring Boot Autoconfiguration 52 Exploring the Power of @Conditional 52 Using @Conditional Based on System Properties 53 Using @Conditional Based on the Presence/Absence of a Java Class 55 Using @Conditional Based on the Configured Spring Beans 55 Using @Conditional Based on a Property’s Configuration 56 Spring Boot’s Built-In @Conditional Annotations 57 How Spring Boot Autoconfiguration Works 59 Summary 62 Chapter 4: Spring Boot Essentials 63 Logging 63 Externalizing Configuration Properties 65 Type-Safe Configuration Properties 65 Relaxed Binding 66 Validating Properties with the Bean Validation API 66 Developer Tools 67 Summary 69 Chapter 5: Working with JdbcTemplate 70 Using JdbcTemplate Without SpringBoot 70 Using JdbcTemplate with Spring Boot 73 Initializing the Database 73 Using Other Connection Pooling Libraries 77 Database Migration with Flyway 78 Summary 79 Chapter 6: Working with MyBatis 80 Using the Spring Boot MyBatis Starter 80 Summary 84 Chapter 7: Working with JOOQ 85 Introduction to JOOQ 85 Using Spring Boot’s JOOQ Starter 86 Configure Spring Boot JOOQ Starter 87 Database Schema 87 Code Generation Using the JOOQ Maven Codegen Plugin 88 Add JOOQ Generated Code as a Source Folder 90 Domain Objects 91 Using JOOQ DSL 91 Summary 96 Chapter 8: Working with JPA 97 Introducing the Spring Data JPA 97 Using Spring Data JPA with Spring Boot 99 Add Dynamic Query Methods 102 Using the Sort and Pagination Features 102 Working with Multiple Databases 103 Use OpenEntityManagerInViewFilter for Multiple Data Sources 110 Summary 111 Chapter 9: Working with MongoDB 112 Introducing MongoDB 112 Installing MongoDB 113 Installing MongoDB on Windows 113 Installing MongoDB on MacOS 114 Installing MongoDB on Linux 114 Getting Started with MongoDB Using the Mongo Shell 114 Introducing Spring Data MongoDB 115 Using Embedded Mongo for Testing 118 Summary 119 Chapter 10: Web Applications with Spring Boot 120 Introducing SpringMVC 120 Developing Web Application Using Spring Boot 122 Using the Tomcat, Jetty, and Undertow Embedded Servlet Containers 125 Customizing Embedded Servlet Containers 127 Customizing SpringMVC Configuration 128 Registering Servlets, Filters, and Listeners as Spring Beans 129 Spring Boot Web Application as a Deployable WAR 132 View Templates that Spring Boot Supports 133 Using the Thymeleaf View Templates 134 Working with Thymeleaf Forms 135 Form Validation 137 File Uploading 141 Using ResourceBundles for Internationalization (i18n) 141 ResourceBundles for Hibernate Validation Errors 142 Error Handling 143 Summary 145 Chapter 11: Building REST APIs Using Spring Boot 146 Introduction to RESTful Web Services 146 REST API Using SpringMVC 147 CORS (Cross-Origin Resource Sharing) Support 157 Class- and Method-Level CORS Configuration 157 Global CORS Configuration 158 Exposing JPA Entities with Bi-Directional References Through RESTful Services 159 Using @JsonIgnore 160 Using @JsonManagedReference and @JsonBackReference 161 REST API Using Spring Data REST 162 Sorting and Pagination 164 CORS Support in Spring Data REST 166 Exception Handling 166 Summary 168 Chapter 12: Reactive Programming Using Spring WebFlux 169 Introduction to Reactive Programming 169 Reactive Streams 170 Project Reactor 170 Reactive Web Applications Using Spring WebFlux 171 WebFlux Using the Annotation-Based Programming Model 172 WebFlux Using a Functional Programming Model 175 HandlerFunction 175 ServerRequest 176 ServerResponse 176 RouterFunction 177 HandlerFilterFunction 177 Registering HandlerFunctions as Method References 178 Thymeleaf Reactive Support 181 Reactive WebClient 184 Testing Spring WebFlux Applications 185 Summary 186 Chapter 13: Securing Web Applications 187 Spring Security in Spring Boot Web Application 187 Implementing the Remember-Me Feature 196 Simple Hash-Based Token as Cookie 196 Persistent Tokens 198 Cross-Site Request Forgery 199 Method-Level Security 200 Securing the REST API Using Spring Security 202 Summary 207 Chapter 14: Spring Boot Actuator 208 Introducing the Spring Boot Actuator 208 Exploring Actuator’s Endpoints 210 The /info Endpoint 211 The /health Endpoint 212 The /beans Endpoint 212 The /autoconfig Endpoint 213 The /mappings Endpoint 215 The /configprops Endpoint 215 The /metrics Endpoint 216 The /env Endpoint 217 The /trace Endpoint 218 The /dump Endpoint 219 The /loggers Endpoint 220 The /logfile Endpoint 222 The /shutdown Endpoint 222 The /actuator Endpoint 223 Customizing Actuator Endpoints 224 Securing Actuator Endpoints 225 Implementing Custom Health Indicators 226 Capturing Custom Application Metrics 228 CORS Support for Actuator Endpoints 230 Monitoring and Management Over JMX 230 Summary 231 Chapter 15: Testing Spring Boot Applications 232 Testing Spring Boot Applications 232 Testing with Mock Implementations 236 Testing with Mockito 238 Testing Slices of Application Using @*Test Annotations 241 Testing SpringMVC Controllers Using @WebMvcTest 242 Testing SpringMVC REST Controllers Using @WebMvcTest 243 Testing Secured Controller/Service Methods 245 Approach One 251 Approach Two 252 Approach Three 252 Testing Persistence Layer Components Using @DataJpaTest and @JdbcTest 252 Summary 257 Chapter 16: Creating a Custom Spring Boot Starter 258 Introducing Twitter4j 258 Custom Spring Boot Starter 259 Create the twitter4j-spring-boot-autoconfigure Module 260 Twitter4j Properties to Hold the Twitter4j Config Parameters 261 Twitter4j Autoconfiguration to Autoconfigure Twitter4j 263 Create the twitter4j-spring-boot-starter Module 264 Application Using twitter4j-spring-boot-starter 266 Summary 268 Chapter 17: Spring Boot with Groovy, Scala, and Kotlin 269 Using Spring Boot with Groovy 269 Introducing Groovy 269 Groovy Strings 269 JavaBean Properties 270 Looping 271 Creating a Spring Boot Application Using Groovy 272 Using Spring Boot with Scala 276 Introducing Scala 276 Type Inference 276 Classes and Objects 277 Traits 277 Creating a Spring Boot Application Using Scala 278 Using Spring Boot with Kotlin 282 Introducing Kotlin 282 Classes 282 Interfaces 282 Data Classes 283 Creating a Spring Boot Application Using Kotlin 283 Summary 288 Chapter 18: Introducing JHipster 289 Introducing JHipster 289 Installing JHipster 289 Prerequisites 290 Creating a JHipster Application 290 Creating Entities 293 Using the JHipster Entity Sub-Generator 294 Using JDL Studio 294 Managing Relationships 295 Summary 297 Chapter 19: Deploying Spring Boot Applications 298 Running Spring Boot Applications in Production Mode 298 Deploying Spring Boot Application on Heroku 300 Running a Spring Boot Application on Docker 305 Installing Docker 305 Running a Spring Boot Application in a Docker Container 306 Running Multiple Containers Using docker-compose 308 Summary 309 Index 310 Front Matter ....Pages i-xx Introduction to Spring Boot (K. Siva Prasad Reddy)....Pages 1-20 Getting Started with Spring Boot (K. Siva Prasad Reddy)....Pages 21-33 Spring Boot Autoconfiguration (K. Siva Prasad Reddy)....Pages 35-45 Spring Boot Essentials (K. Siva Prasad Reddy)....Pages 47-53 Working with JdbcTemplate (K. Siva Prasad Reddy)....Pages 55-64 Working with MyBatis (K. Siva Prasad Reddy)....Pages 65-69 Working with JOOQ (K. Siva Prasad Reddy)....Pages 71-82 Working with JPA (K. Siva Prasad Reddy)....Pages 83-97 Working with MongoDB (K. Siva Prasad Reddy)....Pages 99-106 Web Applications with Spring Boot (K. Siva Prasad Reddy)....Pages 107-132 Building REST APIs Using Spring Boot (K. Siva Prasad Reddy)....Pages 133-155 Reactive Programming Using Spring WebFlux (K. Siva Prasad Reddy)....Pages 157-174 Securing Web Applications (K. Siva Prasad Reddy)....Pages 175-195 Spring Boot Actuator (K. Siva Prasad Reddy)....Pages 197-220 Testing Spring Boot Applications (K. Siva Prasad Reddy)....Pages 221-246 Creating a Custom Spring Boot Starter (K. Siva Prasad Reddy)....Pages 247-257 Spring Boot with Groovy, Scala, and Kotlin (K. Siva Prasad Reddy)....Pages 259-278 Introducing JHipster (K. Siva Prasad Reddy)....Pages 279-287 Deploying Spring Boot Applications (K. Siva Prasad Reddy)....Pages 289-300 Back Matter ....Pages 301-304 Learn Spring Boot and how to build Java-based enterprise, web, and microservice applications with it. In this book, you'll see how to work with relational and NoSQL databases, build your first microservice, enterprise, or web application, and enhance that application with REST APIs. You'll also learn how to build reactive web applications using Spring Boot along with Spring Web Reactive. Then you'll secure your Spring Boot-created application or service before testing and deploying it. After reading and learning with Beginning Spring Boot 2, you'll have the skills and techniques to start building your first Spring Boot applications and microservices with confidence to take the next steps in your career journey. You will: Use Spring Boot autoconfiguration Work with relational and NoSQL databases Build web applications with Spring Boot Apply REST API s using Spring Boot Create reactive web applications using Spring Web Reactive Secure your Spring Boot applications or web services Test and deploy your Spring Boot applications