Book Image

Mastering Spring Boot 2.0

By : Dinesh Rajput
Book Image

Mastering Spring Boot 2.0

By: Dinesh Rajput

Overview of this book

Spring is one of the best frameworks on the market for developing web, enterprise, and cloud ready software. Spring Boot simplifies the building of complex software dramatically by reducing the amount of boilerplate code, and by providing production-ready features and a simple deployment model. This book will address the challenges related to power that come with Spring Boot's great configurability and flexibility. You will understand how Spring Boot configuration works under the hood, how to overwrite default configurations, and how to use advanced techniques to prepare Spring Boot applications to work in production. This book will also introduce readers to a relatively new topic in the Spring ecosystem – cloud native patterns, reactive programming, and applications. Get up to speed with microservices with Spring Boot and Spring Cloud. Each chapter aims to solve a specific problem or teach you a useful skillset. By the end of this book, you will be proficient in building and deploying your Spring Boot application.
Table of Contents (23 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Externalizing configuration with properties


Spring Boot offers you more than 1,000 properties for fine-tuning. Spring Boot documentation (https://docs.spring.io/spring-boot/docs/2.0.2.RELEASE/reference/htmlsingle/#common-application-properties) gives an exhaustive list of these properties. You can use these properties to adjust the settings of your Spring application. You can specify these properties via environment variables, Java system properties, JNDI, command line arguments, or property files. But Spring Boot has an order of overriding these properties in case you define same properties on all of them. Let's see the order of evaluation of the properties in the next section.

Order of evaluation for overridden properties

Let's see the following order of evaluation for overridden properties:

  1. Defined properties for the Devtools global settings in your home directory
  2. Defined properties for @TestPropertySource annotations on your tests
  3. Properties as command-line arguments
  4. Defined properties from...