Adam L. Davis

Spring Quick Reference Guide

A Pocket Handbook for Spring Framework, Spring Boot, and More

1st ed.
Adam L. Davis
Oviedo, FL, USA
ISBN 978-1-4842-6143-9e-ISBN 978-1-4842-6144-6
https://doi.org/10.1007/978-1-4842-6144-6
© Adam L. Davis 2020
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.
The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Distributed to the book trade worldwide by Springer Science+Business Media, 1 New York Plaza, New York, NY 10004, U.S.A. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

Dedicated to my sons

I hope your love of knowledge continues to flourish

Table of Contents
Chapter 1:​ Introduction 1
Who Should Read This Book 2
About This Book 2
Chapter 2:​ Overview 5
Core Spring 5
Spring Modules 7
Chapter 3:​ Dependency Injection 9
Decoupling 9
Configuration 10
Application Context 12
Component Scanning 12
Import 13
Laziness 14
Shut Down the ApplicationConte​xt 14
BeanFactoryPostP​rocessors 14
BeanPostProcesso​rs 15
Init and Destroy Methods 16
Properties 16
Environment 17
Profiles 18
SpEL 19
Testing 20
Chapter 4:​ XML Configuration 23
XML 23
Spring XML Configuration Organization 24
XML Application Context 24
XML Beans 26
Init and Destroy 27
Enabling AOP 28
AOP Configuration 28
Enabling Spring Data JPA 29
Mixing XML and Java Configuration 30
Chapter 5:​ Spring AOP 33
Terminology 34
Advice 34
How to Enable AOP 35
How to Define a Pointcut 36
Annotations 38
Pointcut Expressions 38
Bindings in Spring AOP 40
Limitations of Spring AOP 40
Alternatives 41
Chapter 6:​ Spring Data 43
Domain Entities 43
Spring Data JDBC 46
Getting Started 46
Defining a Repository 47
Custom Queries 48
Custom Queries in JPA 49
JdbcTemplate 51
Spring Data JPA 51
Paging and Sorting 52
Transactions 53
Spring Data R2DBC 56
Custom Reactive Queries 59
Kotlin Support 59
Chapter 7:​ Spring MVC 61
Core Concepts 61
Getting Started 62
Controllers 63
Request Mappings 63
Path Regular Expressions 65
Mapping Method Parameters 66
Response Body 67
Views 68
View Resolvers 69
Error Handling 72
Web Scopes 73
Testing 73
Chapter 8:​ Spring Mobile 79
Getting Started 79
DeviceResolverHa​ndlerInterceptor​ 80
DeviceResolverRe​questFilter 81
Accessing the Device 82
DeviceWebArgumen​tResolver 83
LiteDeviceResolv​er 83
Site Preference Management 84
Spring Mobile Example 86
Chapter 9:​ Spring Security 95
Features 95
Overview 96
Configuration 96
Password Security 99
Accessing the Authentication 100
Annotation Security 101
Using @Secured 102
Using PreAuthorize 103
Global Method Security 104
SpEL 104
Chapter 10:​ Spring Web Services 107
Features 107
Getting Started 108
Spring Boot Config 110
Contract First 110
Writing the Endpoint 112
Generating the WSDL 114
EndpointMappings​ and EndpointExceptio​nResolvers 115
Customizing 116
EndpointIntercep​tor 117
Chapter 11:​ Spring REST 119
Spring REST Docs 120
Getting Started 120
REST Docs Generation 123
Serving the Documentation in Spring Boot 125
Spring HATEOAS 125
Getting Started 126
Creating Links 126
Testing 128
Chapter 12:​ Reactor 133
Why Use Reactor?​ 133
Getting Started 134
Flux 135
Mono 136
Creating a Flux or Mono 136
Schedulers 139
Pull Events 141
Handling Backpressure 142
Context 144
Testing 145
StepVerifier 146
TestPublisher 148
Tuples and Zip 149
Reactor Addons 151
Chapter 13:​ Spring Integration 153
Features 153
Getting Started 154
Adding Additional Support 156
Message Gateway 157
IntegrationFlow 158
Kafka Config 163
Topics 164
Monitoring 165
Chapter 14:​ Spring Batch 167
Features 167
Overview 167
The Example 168
Build 168
Schema 172
Course 173
CourseProcessor 174
BatchConfigurati​on 175
JobExecutionList​ener 179
Spring Batch Metadata 180
Spring Retry 181
Retry Terms 183
Retryable Annotation 183
Chapter 15:​ Spring Boot 185
Introduction to Spring Boot 185
Creating a New Project 186
Spring Boot CLI 187
SpringBootApplic​ation 188
Auto-configuration 189
Enabling Auto-config 190
Excluding Auto-config 192
Application Properties 193
Overriding Properties 193
Auto Spring AOP 194
Spring Boot Actuator 194
Spring Boot Testing 194
Chapter 16:​ Spring Boot Actuator 199
Default Endpoints 199
Configuring Actuator 201
Exposing Endpoints 201
Info 202
Health 203
Auto-configured HealthIndicators​ 203
Custom Health 204
Metrics 206
Audit 208
Logging 208
Chapter 17:​ Spring WebFlux 211
Getting Started 212
Gradle Plugin 212
Tasks 214
SpringBootApplic​ation 214
Our Domain Model 215
ReactiveMongoRep​ository 217
Controllers 218
View Templates 219
RESTful API 221
Further Configuration 224
Testing 227
Spring Data R2DBC 228
Netty or Tomcat 228
WebClient 228
Chapter 18:​ Spring Cloud 231
Features 231
Getting Started 232
Spring Cloud Netflix 235
Finding a Service 237
Spring Cloud Config 239
Spring Cloud OpenFeign 240
Spring Cloud for AWS 241
Spring Cloud Stream 242
Index 247
About the Author
Adam L. Davis
../images/498572_1_En_BookFrontmatter_Figb_HTML.jpg
makes software. He’s spent many years developing in Java (since Java 1.2), has enjoyed using Spring for more than a decade, and is a Certified Spring Professional. He has experience using Java, Groovy, JavaScript, AWS, Hibernate, and much more to build applications and has worked at both large and small corporations.

Adam holds a master’s degree in Computer Science from Georgia Tech. He is also the author of Reactive Streams in Java (Apress, 2019) and Learning Groovy 3 (Apress, 2019). You can check out his website at http://adamldavis.com/ .

 
About the Technical Reviewer
Manuel Jordan Elera
../images/498572_1_En_BookFrontmatter_Figc_HTML.jpg

is an autodidactic developer and researcher who enjoys learning new technologies for his own experiments and creating new integrations. Manuel won the Springy Award – Community Champion and Spring Champion 2013. In his little free time, he reads the Bible and composes music on his guitar. Manuel is known as dr_pompeii. He has tech-reviewed numerous books for Apress, including Pro Spring Boot 2 (2019), Rapid Java Persistence and Microservices (2019), Java Language Features (2018), Spring Boot 2 Recipes (2018), and Java APIs, Extensions and Libraries (2018). Read his 13 detailed tutorials about many Spring technologies, contact him through his blog at www.manueljordanelera.blogspot.com , and follow him on his Twitter account, @dr_pompeii.