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  • Book Overview & Buying Spring Boot Cookbook
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Spring Boot Cookbook

Spring Boot Cookbook

By : Alex Antonov
4.6 (5)
Buy this Book
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Spring Boot Cookbook

Spring Boot Cookbook

4.6 (5)
By: Alex Antonov
Buy this Book

Overview of this book

Spring Boot is Spring's convention-over-configuration solution. This feature makes it easy to create Spring applications and services with absolute minimum fuss. Spring Boot has the great ability to be customized and enhanced, and is specifically designed to simplify development of a new Spring application. This book will provide many detailed insights about the inner workings of Spring Boot, as well as tips and recipes to integrate the third-party frameworks and components needed to build complex enterprise-scale applications. The book starts with an overview of the important and useful Spring Boot starters that are included in the framework, and teaches you to create and add custom Servlet Filters, Interceptors, Converters, Formatters, and PropertyEditors to a Spring Boot web application. Next it will cover configuring custom routing rules and patterns, adding additional static asset paths, and adding and modifying servlet container connectors and other properties such as enabling SSL. Moving on, the book will teach you how to create custom Spring Boot Starters, and explore different techniques to test Spring Boot applications. Next, the book will show you examples of configuring your build to produce Docker images and self-executing binary files for Linux/OSX environments. Finally, the book will teach you how to create custom health indicators, and access monitoring data via HTTP and JMX.
Table of Contents (9 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with Spring Boot
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1. Getting Started with Spring Boot
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Introduction
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Using a Spring Boot template and starters
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Creating a simple application
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Launching an application using Gradle
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Using the command-line runners
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Setting up a database connection
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Setting up a data repository service
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Scheduling executors
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2. Configuring Web Applications
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2. Configuring Web Applications
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Creating a basic RESTful application
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Creating a Spring Data REST service
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Configuring custom servlet filters
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Configuring custom interceptors
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Configuring custom HttpMessageConverters
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Configuring custom PropertyEditors
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Configuring custom type Formatters
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3. Web Framework Behavior Tuning
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3. Web Framework Behavior Tuning
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Introduction
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Configuring route matching patterns
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Configuring custom static path mappings
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Tuning Tomcat via EmbeddedServletContainerCustomizer
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Choosing embedded servlet containers
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Adding custom connectors
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4. Writing Custom Spring Boot Starters
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4. Writing Custom Spring Boot Starters
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Introduction
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Understanding Spring Boot autoconfiguration
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Creating a custom Spring Boot autoconfiguration starter
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Configuring custom conditional bean instantiations
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Using custom @Enable* annotations to toggle configurations
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5. Application Testing
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5. Application Testing
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Introduction
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Creating tests for Spring MVC Controllers
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Automatically configuring the database schema and populating it with data
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Creating tests using in-memory database with data fixtures
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Creating tests using Mockito to mock DB
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Writing tests using Cucumber
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Writing tests using Spock
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6. Application Packaging and Deployment
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6. Application Packaging and Deployment
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Introduction
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Creating a Spring Boot executable JAR
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Creating Docker images
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Building self-executing binaries
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Spring Boot environment config hierarchy and precedence
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Externalizing environmental config using property files
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Externalizing environmental config using environment variables
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Externalizing environmental config using Java system properties
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Setting up Consul
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Externalizing environmental config using Consul and envconsul
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7. Health Monitoring and Data Visualization
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7. Health Monitoring and Data Visualization
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Introduction
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Writing custom health indicators
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Emitting metrics
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Monitoring Spring Boot via JMX
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Management of Spring Boot via CRaSH and writing custom remote shell commands
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Integrating Codahale/Dropwizard metrics with Graphite
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Integrating Codahale/Dropwizard metrics with Dashing
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Index
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Index

Launching an application using Gradle

Typically, the very first step of creating any application is to have a basic skeleton, which can be immediately launched as is. As the Spring Boot starter has created the application template for us already, all we have to do is extract the code, build, and execute it. Now let's go to the console and launch the app with Gradle.

How to do it…

  1. Change in the directory where the bookpub.zip archive was extracted from and execute the following command from the command line:
    $ ./gradlew clean bootRun

Tip

If you don't have gradlew in the directory, then download a version of Gradle from https://gradle.org/downloads or install it via homebrew by executing brew install gradle. After Gradle is installed, run gradle wrapper to get the Gradle wrapper files generated. Another way is to invoke gradle clean bootRun in order to achieve the same results.

The output of the preceding command will be as follows:

…
  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::  (v1.2.3.BUILD-SNAPSHOT)

2015-03-09 23:18:53.721 : Starting BookPubApplication on mbp with PID 43850 
2015-03-09 23:18:53.781 : Refreshing org.springframework.context.annotation.Annotatio
2015-03-09 23:18:55.544 : Building JPA container EntityManagerFactory for persistence 
2015-03-09 23:18:55.565 : HHH000204: Processing PersistenceUnitInfo [name: default	
2015-03-09 23:18:55.624 : Hibernate Core {4.3.8.Final}
2015-03-09 23:18:55.625 : HHH000206: hibernate.properties not found
2015-03-09 23:18:55.627 : HHH000021: Bytecode provider name : javassist
2015-03-09 23:18:55.774 : HCANN000001: Hibernate Commons Annotations {4.0.5.Final
2015-03-09 23:18:55.850 : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2015-03-09 23:18:55.902 : HHH000397: Using ASTQueryTranslatorFactory
2015-03-09 23:18:56.094 : HHH000227: Running hbm2ddl schema export
2015-03-09 23:18:56.096 : HHH000230: Schema export complete
2015-03-09 23:18:56.337 : Registering beans for JMX exposure on startup
2015-03-09 23:18:56.345 : Started BookPubApplication in 3.024 seconds (JVM running...
2015-03-09 23:18:56.346 : Closing org.springframework.context.annotation.AnnotationC..
2015-03-09 23:18:56.347 : Unregistering JMX-exposed beans on shutdown
2015-03-09 23:18:56.349 : Closing JPA EntityManagerFactory for persistence unit 'def…
2015-03-09 23:18:56.349 : HHH000227: Running hbm2ddl schema export
2015-03-09 23:18:56.350 : HHH000230: Schema export complete
BUILD SUCCESSFUL
Total time: 52.323 secs

How it works…

As we can see, the application started just fine, but as we didn't add any functionality or configure any services, it terminated right away. From the startup log, however, we do see that the autoconfiguration did take place. Let's take a look at the following lines:

Building JPA container EntityManagerFactory for persistence unit 'default'
HHH000412: Hibernate Core {4.3.8.Final}
HHH000400: Using dialect: org.hibernate.dialect.H2Dialect

This information tells us that because we added the jdbc and data-jpa starters, the JPA container was created and will use Hibernate 4.3.8.Final to manage the persistence using H2Dialect. This was possible because we had the right classes in the classpath.

Tip

Downloading the example code

You can download the example code files for all Packt books you have purchased from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

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