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README.adoc

Spring Boot Build Status Chat

Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss. It takes an opinionated view of the Spring platform so that new and existing users can quickly get to the bits they need.

You can use Spring Boot to create stand-alone Java applications that can be started using java -jar or more traditional WAR deployments. We also provide a command line tool that runs spring scripts.

Our primary goals are:

  • Provide a radically faster and widely accessible getting started experience for all Spring development

  • Be opinionated out of the box, but get out of the way quickly as requirements start to diverge from the defaults

  • Provide a range of non-functional features that are common to large classes of projects (e.g. embedded servers, security, metrics, health checks, externalized configuration)

  • Absolutely no code generation and no requirement for XML configuration

Installation and Getting Started

The reference documentation includes detailed installation instructions as well as a comprehensive getting started guide.

Here is a quick teaser of a complete Spring Boot application in Java:

import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.web.bind.annotation.*;

@RestController
@SpringBootApplication
public class Example {

	@RequestMapping("/")
	String home() {
		return "Hello World!";
	}

	public static void main(String[] args) {
		SpringApplication.run(Example.class, args);
	}

}

Getting help

Having trouble with Spring Boot? We’d like to help!

Reporting Issues

Spring Boot uses GitHub’s integrated issue tracking system to record bugs and feature requests. If you want to raise an issue, please follow the recommendations below:

  • Before you log a bug, please search the issue tracker to see if someone has already reported the problem.

  • If the issue doesn’t already exist, create a new issue.

  • Please provide as much information as possible with the issue report, we like to know the version of Spring Boot that you are using, as well as your Operating System and JVM version.

  • If you need to paste code, or include a stack trace use Markdown ``` escapes before and after your text.

  • If possible try to create a test-case or project that replicates the problem and attach it to the issue.

Building from Source

You don’t need to build from source to use Spring Boot (binaries in repo.spring.io), but if you want to try out the latest and greatest, Spring Boot can be built and published to your local Maven cache using the Gradle wrapper. You also need JDK 1.8.

$ ./gradlew publishToMavenLocal

This will build all of the jars and documentation and publish them to your local Maven cache. It won’t run any of the tests. If you want to build everything, use the build task:

$ ./gradlew build

Also see CONTRIBUTING.adoc if you wish to submit pull requests, and in particular please fill out the Contributor’s Agreement before your first change, however trivial.

Modules

There are a number of modules in Spring Boot, here is a quick overview:

spring-boot

The main library providing features that support the other parts of Spring Boot, these include:

  • The SpringApplication class, providing static convenience methods that can be used to write a stand-alone Spring Application. Its sole job is to create and refresh an appropriate Spring ApplicationContext

  • Embedded web applications with a choice of container (Tomcat, Jetty or Undertow)

  • First class externalized configuration support

  • Convenience ApplicationContext initializers, including support for sensible logging defaults

spring-boot-autoconfigure

Spring Boot can configure large parts of common applications based on the content of their classpath. A single @EnableAutoConfiguration annotation triggers auto-configuration of the Spring context.

Auto-configuration attempts to deduce which beans a user might need. For example, if HSQLDB is on the classpath, and the user has not configured any database connections, then they probably want an in-memory database to be defined. Auto-configuration will always back away as the user starts to define their own beans.

spring-boot-starters

Starters are a set of convenient dependency descriptors that you can include in your application. You get a one-stop-shop for all the Spring and related technology that you need without having to hunt through sample code and copy paste loads of dependency descriptors. For example, if you want to get started using Spring and JPA for database access include the spring-boot-starter-data-jpa dependency in your project, and you are good to go.

spring-boot-cli

The Spring command line application compiles and runs Groovy source, allowing you to write the absolute minimum of code to get an application running. Spring CLI can also watch files, automatically recompiling and restarting when they change.

spring-boot-actuator

Actuator endpoints let you monitor and interact with your application. Spring Boot Actuator provides the infrastructure required for actuator endpoints. It contains annotation support for actuator endpoints. Out of the box, this module provides a number of endpoints including the HealthEndpoint, EnvironmentEndpoint, BeansEndpoint and many more.

spring-boot-actuator-autoconfigure

This provides auto-configuration for actuator endpoints based on the content of the classpath and a set of properties. For instance, if Micrometer is on the classpath, it will auto-configure the MetricsEndpoint. It contains configuration to expose endpoints over HTTP or JMX. Just like Spring Boot AutoConfigure, this will back away as the user starts to define their own beans.

spring-boot-test

This module contains core items and annotations that can be helpful when testing your application.

spring-boot-test-autoconfigure

Like other Spring Boot auto-configuration modules, spring-boot-test-autoconfigure, provides auto-configuration for tests based on the classpath. It includes a number of annotations that can be used to automatically configure a slice of your application that needs to be tested.

spring-boot-loader

Spring Boot Loader provides the secret sauce that allows you to build a single jar file that can be launched using java -jar. Generally you will not need to use spring-boot-loader directly, but instead work with the Gradle or Maven plugin.

spring-boot-devtools

The spring-boot-devtools module provides additional development-time features such as automatic restarts, for a smoother application development experience. Developer tools are automatically disabled when running a fully packaged application.

Samples

Groovy samples for use with the command line application are available in spring-boot-cli/samples. To run the CLI samples type spring run <sample>.groovy from samples directory.

Guides

The spring.io site contains several guides that show how to use Spring Boot step-by-step:

License

Spring Boot is Open Source software released under the Apache 2.0 license.

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