docs | ||
eclipse | ||
spring-boot | ||
spring-boot-actuator | ||
spring-boot-autoconfigure | ||
spring-boot-cli | ||
spring-boot-integration-tests | ||
spring-boot-samples | ||
spring-boot-starters | ||
spring-boot-tools | ||
.gitignore | ||
.travis.yml | ||
CONTRIBUTING.md | ||
pom.xml | ||
README.md |
Spring Boot
Spring Boot makes it easy 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
Quick Start Script Example
The Spring Boot command line tool uses Groovy underneath so that we can present simple Spring snippets that can 'just run', for example:
@Controller
class ThisWillActuallyRun {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!"
}
}
$ spring run app.groovy
$ curl localhost:8080
Hello World!
See below for command line tool installation instructions.
Quick Start Java Example
If you don't want to use the command line tool, or you would rather work using Java and
an IDE you can. Just add a main()
method that calls SpringApplication
and
add @EnableAutoConfiguration
:
import org.springframework.boot.*;
import org.springframework.boot.autoconfiguration.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
@Controller
@EnableAutoConfiguration
public class SampleController {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!"
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
}
}
NOTE: the above example assumes your build system has imported the spring-starter-web
maven pom.
Installing the CLI
You need Java SDK v1.6 or higher to run the command line tool. You should check your current Java installation before you begin:
$ java -version
Spring Boot CLI can be downloaded from our Maven repository, and then you can use a shell alias
for the Spring Boot command line tool:
$ wget http://repo.springframework.org/milestone/org/springframework/boot/spring-boot-cli/0.5.0.M1/spring-boot-cli-0.5.0.M1.jar
$ alias spring="java -jar `pwd`/spring-cli-0.5.0.M1.jar"
Complete installation including a downloadable .zip
with a shell script TBD.
Building from source
Spring Boot can be built with maven v3.0 or above.
$ mvn clean install
Also see CONTRIBUTING.md if you wish to submit pull requests.
Spring Boot Modules
There are a number of modules in Spring Boot. Here are the important ones:
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 make it easy to write a stand-alone Spring Application. Its sole job is to create and refresh an appropriate SpringApplicationContext
- Embedded web applications with a choice of container (Tomcat or Jetty for now)
- 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.
See spring-boot-autoconfigure/README.md.
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 just include the spring-boot-starter-data-jpa
dependency in your
project, and you are good to go.
See spring-boot-starters/README.md.
spring-boot-cli
The Spring command line application compiles and runs Groovy source, making it super easy 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.
See spring-boot-cli/README.md.
spring-boot-actuator
Spring Boot Actuator provides additional auto-configuration to decorate your application with features that make it instantly deployable and supportable in production. For instance if you are writing a JSON web service then it will provide a server, security, logging, externalized configuration, management endpoints, an audit abstraction, and more. If you want to switch off the built in features, or extend or replace them, it makes that really easy as well.
See spring-boot-actuator/README.md.
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.
See spring-boot-loader/README.md.
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.
Java samples are available in spring-boot-samples and should
be build with maven and run use java -jar target/<sample>.jar
. The following java
samples are provided:
- spring-boot-sample-simple - A simple command line application
- spring-boot-sample-tomcat - Embedded Tomcat
- spring-boot-sample-jetty - Embedded Jetty
- spring-boot-sample-actuator - Simple REST service with production features
- spring-boot-sample-actuator-ui - A web UI example with production features
- spring-boot-sample-web-ui - A thymeleaf web application
- spring-boot-sample-web-static - A web application service static files
- spring-sample-batch - Define and run a Batch job in a few lines of code
- spring-sample-data-jpa - Spring Data JPA + Hibernate + HSQLDB
- spring-boot-sample-integration - A spring integration application
- spring-boot-sample-profile - example showing Spring's
@profile
support - spring-boot-sample-traditional - shows more traditional WAR packaging
(but also executable using
java -jar
) - spring-boot-sample-xml - Example show how Spring Boot can be mixed with traditional
XML configuration (we generally recommend using Java
@Configuration
whenever possible)