Beginning Spring Boot 2 (eBook)

K. Siva Prasad Reddy is a Senior Software Engineer having more than seven years of experience in developing enterprise applications with Java and Java EE technologies. Siva is a Sun Certified Java Programmer and has a lot of experience in server-side technologies such as Java, Java EE, Spring, Hibernate, MyBatis, JSF, PrimeFaces, and WebServices (SOAP/REST).

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