Spring Boot

Spring Boot
Original author(s)	Rod Johnson
Developer(s)	VMware
Initial release	April 2014; 10 years ago
Stable release	3.2.5 / 18 April 2024; 11 days ago
Repository	github.com/spring-projects/spring-boot ;
Written in	Java
Platform	Java EE
Type	Application framework
License	Apache License 2.0
Website	spring.io/projects/spring-boot

Spring Boot is an open-source Java framework used to create a Micro Service. Spring boot is used for programming standalone, production-grade Spring-based applications with minimal effort.^[3] Spring Boot is a convention-over-configuration extension for the Spring Java platform intended to help minimize configuration concerns while creating Spring-based applications.^[4]^[5] Most of the application can be preconfigured using Spring team's "opinionated view"^[6]^[7] of the best configuration and use of the Spring platform and third-party libraries.

It is widely used for building microservices, web applications, and other Java-based projects due to its ease of use and robustness.

Features[edit]

Embedded Tomcat, Jetty or Undertow web application server.^[8]
Provide opinionated 'starter' Project Object Models (POMs) for the build tool. The only build tools supported are Maven and Gradle.^[9]^[10]
Automatic configuration of the Spring Application.^[11]
Provide production-ready^[4] functionality such as metrics,^[12] health checks,^[12] and externalized configuration.^[13]
No code generation is required.^[8]
No XML configuration is required.^[9]
Optional support for Kotlin and Apache Groovy^[14] in addition to Java.^[15]

Bootstrapping DispatcherServlet[edit]

Spring Boot does not require manual configuration of the DispatcherServlet, since it automatically configures the application based on the configuration it detects. ^[16]

SpringBootServletInitializer[edit]

Spring Boot has a class SpringBootServletInitializer, which is a specialization of the WebApplicationInitializer.^[16] This SpringBootServletInitializer is an out-of-the-box implementation of WebApplicationInitializer, which eliminates the need for the developer to construct their own implementation of the WebApplicationInitializer class.^[16]

Configuration properties[edit]

The configuration properties for the Spring Boot application can be specified in the application.properties or application.yml file.^[16] Examples of properties that can be included in this file include the server.port and spring.application.name properties.^[16]

Autoconfiguration[edit]

@SpringBootApplication[edit]

Spring boot has an annotation, @SpringBootApplication, which allows the Spring Boot application to autoconfigure third-party libraries and detected features found on the classpath.^[16] As an example, the class that has the @SpringBootApplication annotation can extend the SpringBootServerInitializer class if the application is packaged and deployed as a WAR file.^[16]

The @SpringBootApplication annotation combines three Spring-specific annotations: @SpringBootConfiguration, @EnableAutoConfiguration and @ComponentScan.^[17]

@SpringBootConfiguration[edit]

The @SpringBootConfiguration annotation is a specialization of the Spring-specific @Configuration annotation.^[17] The class with the @SpringBootConfiguration is marked as the configuration class for the Spring Boot application.^[17]

@EnableAutoConfiguration[edit]

The @EnableAutoConfiguration annotation is Spring-specific annotation that enables the Spring Boot automatic configuration. ^[17]

Actuator[edit]

The Spring Boot Actuator allows for monitoring and management capabilities for the Spring Boot Application.^[18] A major advantage of using the Spring Boot Actuator is that it implements a number of production-ready features without requiring the developer to construct their own implementations.^[18]

If Maven is used as the build tool, then the spring-boot-starter-actuator dependency can be specified in the pom.xml configuration file.^[19]

Integration with Spring Framework Modules[edit]

Spring Boot has a number of existing Spring Framework Modules.

Spring Security[edit]

Spring Boot has integration with the Spring Security Module. The simplest way for integrating Spring Boot with Spring Security is to declare the starter dependency in the build configuration file.^[20]

If Maven is used as the build tool, then the dependency with artifact ID spring-boot-starter-security dependency can be specified in the pom.xml configuration file.^[20]

Application Servers[edit]

By default, Spring boot provides embedded web servers (such as TomCat) out-of-the-box.^[21] However, Spring Boot can also be deployed as a WAR file on a standalone WildFly application server.^[22]

If Maven is used as the build tool, there is a wildfly-maven-plugin Maven plugin that allows for automatic deployment of the generated WAR file.^[22]

References[edit]

^ "Spring Boot v1.0.0.RELEASE". github.com.
^ "Release 3.2.5". 18 April 2024. Retrieved 25 April 2024.
^ "Spring Boot Tutorial - Learn Spring Boot". GeeksforGeeks. 2023-05-08. Retrieved 2024-04-05.
^ ^a ^b Walls 2016, p. vii, §foreword.
^ Walls 2016, pp. 37–48, §2.3.
^ Walls 2016, p. 48, §2.4.
^ Deinum & Cosmina 2021, pp. 21–22, §2 Spring Framework Fundamentals.
^ ^a ^b Walls 2016, p. 7, §1.1.3.
^ ^a ^b Walls 2016, p. x, §Preface.
^ Musib 2022, p. 9, §1.2.1 Maven vs Gradle.
^ Walls 2016, pp. 4–5, §1.1.2.
^ ^a ^b Walls 2016, pp. 124–139, §7.
^ Walls 2016, pp. 49–69, §3.1-§3.2.3.
^ "Language Support". Spring Framework.
^ Musib 2022, p. 9, §1.2.2 Java vs Kotlin.
^ ^a ^b ^c ^d ^e ^f ^g Deinum & Cosmina 2021, pp. 52–54, §2 Spring Framework Fundamentals - Spring Boot.
^ ^a ^b ^c ^d Walls 2019, pp. 11–17, §1.2.2 Examining the Spring project structure.
^ ^a ^b Musib 2022, pp. 144–145, §4.4 Spring Boot Actuator.
^ Musib 2022, pp. 145–146, §4.4.1 Configuring Spring Boot Actuator in a Spring Boot application.
^ ^a ^b Musib 2022, pp. 187–192, §5.2.1 Configuring Spring Boot Actuator in a Spring Boot application.
^ Musib 2022, pp. 7–8, §1.1.4 Spring Boot components.
^ ^a ^b Musib 2022, pp. 406–417, §9.2 Deploying Spring Boot application as WAR in the wildfly application server.

Deinum, Marten; Cosmina, Iuliana (2021). Pro Spring MVC with WebFlux. Berkeley, CA: Apress. doi:10.1007/978-1-4842-5666-4. ISBN 978-1-4842-5665-7. S2CID 231672329.
Musib, Somnath (July 12, 2022). Spring Boot in Practice. Simon and Schuster. ISBN 978-1-61729-881-3.
Walls, Craig (Jan 3, 2016). Spring Boot in Action. Manning. ISBN 978-1-61729-254-5.
Walls, Craig (2019). Spring in Action. Manning. ISBN 978-1-61729-494-5.

External links[edit]

Official website

[1] "Spring Boot v1.0.0.RELEASE". github.com.

[wikidata-4c6902f686d8d62476f901205b3be95bc739fc4b-v11-2] "Release 3.2.5". 18 April 2024. Retrieved 25 April 2024.

[3] "Spring Boot Tutorial - Learn Spring Boot". GeeksforGeeks. 2023-05-08. Retrieved 2024-04-05.

[FOOTNOTEWalls2016vii§foreword-4] Walls 2016, p. vii, §foreword.

[FOOTNOTEWalls201637–48§2.3-5] Walls 2016, pp. 37–48, §2.3.

[FOOTNOTEWalls201648§2.4-6] Walls 2016, p. 48, §2.4.

[FOOTNOTEDeinumCosmina202121–22§2_Spring_Framework_Fundamentals-7] Deinum & Cosmina 2021, pp. 21–22, §2 Spring Framework Fundamentals.

[FOOTNOTEWalls20167§1.1.3-8] Walls 2016, p. 7, §1.1.3.

[FOOTNOTEWalls2016x§Preface-9] Walls 2016, p. x, §Preface.

[FOOTNOTEMusib20229§1.2.1_Maven_vs_Gradle-10] Musib 2022, p. 9, §1.2.1 Maven vs Gradle.

[FOOTNOTEWalls20164–5§1.1.2-11] Walls 2016, pp. 4–5, §1.1.2.

[FOOTNOTEWalls2016124–139§7-12] Walls 2016, pp. 124–139, §7.

[FOOTNOTEWalls201649–69§3.1-§3.2.3-13] Walls 2016, pp. 49–69, §3.1-§3.2.3.

[14] "Language Support". Spring Framework.

[FOOTNOTEMusib20229§1.2.2_Java_vs_Kotlin-15] Musib 2022, p. 9, §1.2.2 Java vs Kotlin.

[FOOTNOTEDeinumCosmina202152–54§2_Spring_Framework_Fundamentals_-_Spring_Boot-16] ^ ^a ^b ^c ^d ^e ^f ^g Deinum & Cosmina 2021, pp. 52–54, §2 Spring Framework Fundamentals - Spring Boot.

[FOOTNOTEWalls201911–17§1.2.2_Examining_the_Spring_project_structure-17] Walls 2019, pp. 11–17, §1.2.2 Examining the Spring project structure.

[FOOTNOTEMusib2022144–145§4.4_Spring_Boot_Actuator-18] Musib 2022, pp. 144–145, §4.4 Spring Boot Actuator.

[FOOTNOTEMusib2022145–146§4.4.1_Configuring_Spring_Boot_Actuator_in_a_Spring_Boot_application-19] Musib 2022, pp. 145–146, §4.4.1 Configuring Spring Boot Actuator in a Spring Boot application.

[FOOTNOTEMusib2022187–192§5.2.1_Configuring_Spring_Boot_Actuator_in_a_Spring_Boot_application-20] Musib 2022, pp. 187–192, §5.2.1 Configuring Spring Boot Actuator in a Spring Boot application.

[FOOTNOTEMusib20227–8§1.1.4_Spring_Boot_components-21] Musib 2022, pp. 7–8, §1.1.4 Spring Boot components.

[FOOTNOTEMusib2022406–417§9.2_Deploying_Spring_Boot_application_as_WAR_in_the_wildfly_application_server-22] Musib 2022, pp. 406–417, §9.2 Deploying Spring Boot application as WAR in the wildfly application server.

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