Spring Initializr - Bootstrap Your Spring Boot Applications at F1 speed!


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Spring Initializr http://start.spring.io/ is great tool to bootstrap your Spring Boot projects.

It allows you to create varied range of Spring Boot based Applications from a very simple UI. Some of the types of applications you can bootstrap are:

  • Web Applications
  • Restful Applications
  • Batch Applications

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Spring Boot provides a wide range of starter projects. Spring Initializr supports all of them and more. Among a varied range of starter projects and options supported are:

  • spring-boot-starter-web-services : For building applications exposing SOAP Web Services
  • spring-boot-starter-web - Build Web applications & RESTful applications
  • spring-boot-starter-test - Write great Unit and Integration Tests
  • spring-boot-starter-jdbc - Traditional JDBC Applications
  • spring-boot-starter-hateoas - Make your services more RESTful by adding HATEOAS features
  • spring-boot-starter-security - Authentication and Authorization using Spring Security
  • spring-boot-starter-data-jpa - Spring Data JPA with Hibernate
  • spring-boot-starter-cache - Enabling Spring Framework’s caching support
  • spring-boot-starter-data-rest - Expose Simple REST Services using Spring Data REST

In this guide, lets consider creating a simple web application with Spring Initializr.

Bootstrapping a Web application with Spring Initializr

Creating a Web application with Spring Initializr is very simple.

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As shown in the image above, following steps have to be done

  • Launch Spring Initializr http://start.spring.io/ and choose the following
    • Choose com.in28minutes.springboot as Group
    • Choose student-services as Artifact
    • Choose following dependencies
      • Web
  • Click Generate Project button at the bottom of the page.
  • Import the project into Eclipse.

Structure of the project created

Screenshot shows the project structure of the imported maven project.

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  • StudentServicesApplication.java - Spring Boot Launcher. Initializes Spring Boot Auto Configuration and Spring Application Context.
  • application.properties - Application Configuration file.
  • StudentServicesApplicationTests.java - Simple launcher for use in unit tests.
  • pom.xml - Included dependencies for Spring Boot Starter Web. Uses Spring Boot Starter Parent as parent pom.

Complete Code Generated

Lets look at each of the file that is generated

/pom.xml

Three important things that are configured in pom.xml.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.in28minutes.springboot</groupId>
	<artifactId>student-services-initializr</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>student-services</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.3.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

/src/main/java/com/in28minutes/springboot/StudentServicesApplication.java

package com.in28minutes.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class StudentServicesApplication {

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

/src/main/resources/application.properties


/src/test/java/com/in28minutes/springboot/StudentServicesApplicationTests.java

package com.in28minutes.springboot;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentServicesApplicationTests {

	@Test
	public void contextLoads() {
	}

}

Running the application

Following log is generate when you run StudentServicesApplication.java as a Java Application.


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.4.4.RELEASE)

2017-01-28 17:37:28.970  INFO 4311 --- [  restartedMain] c.i.s.StudentServicesApplication         : Starting StudentServicesApplication on Rangas-MacBook-Pro.local with PID 4311 (/in28Minutes/Workspaces/SpringBootTutorialWebsite2017Jan/creating-web-project/target/classes started by rangaraokaranam in /in28Minutes/Workspaces/SpringBootTutorialWebsite2017Jan/creating-web-project)
2017-01-28 17:37:28.978  INFO 4311 --- [  restartedMain] c.i.s.StudentServicesApplication         : No active profile set, falling back to default profiles: default
2017-01-28 17:37:29.179  INFO 4311 --- [  restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot[email protected]3c9199ed: startup date [Sat Jan 28 17:37:29 IST 2017]; root of context hierarchy
2017-01-28 17:37:30.970  INFO 4311 --- [  restartedMain] o.s.core.annotation.AnnotationUtils      : Failed to introspect annotations on [class org.springframework.boot.actuate.autoconfigure.EndpointWebMvcHypermediaManagementContextConfiguration]: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
2017-01-28 17:37:30.972  INFO 4311 --- [  restartedMain] o.s.core.annotation.AnnotationUtils      : Failed to introspect annotations on [class org.springframework.boot.actuate.autoconfigure.EndpointWebMvcHypermediaManagementContextConfiguration]: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
2017-01-28 17:37:33.167  INFO 4311 --- [  restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-01-28 17:37:33.224  INFO 4311 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-01-28 17:37:33.226  INFO 4311 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.11
2017-01-28 17:37:33.437  INFO 4311 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-01-28 17:37:33.438  INFO 4311 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 4296 ms
2017-01-28 17:37:33.905  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-01-28 17:37:33.911  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'metricsFilter' to: [/*]
2017-01-28 17:37:33.912  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-01-28 17:37:33.912  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-01-28 17:37:33.912  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-01-28 17:37:33.912  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-01-28 17:37:33.913  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'webRequestLoggingFilter' to: [/*]
2017-01-28 17:37:33.913  INFO 4311 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'applicationContextIdFilter' to: [/*]
2017-01-28 17:37:34.546  INFO 4311 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot[email protected]3c9199ed: startup date [Sat Jan 28 17:37:29 IST 2017]; root of context hierarchy
2017-01-28 17:37:34.653  INFO 4311 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-01-28 17:37:34.654  INFO 4311 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-01-28 17:37:34.717  INFO 4311 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-01-28 17:37:34.717  INFO 4311 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-01-28 17:37:34.785  INFO 4311 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-01-28 17:37:35.364  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/dump || /dump.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.366  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/metrics/{name:.*}],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint.value(java.lang.String)
2017-01-28 17:37:35.367  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/metrics || /metrics.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.369  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/trace || /trace.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.370  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/configprops || /configprops.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.371  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/info || /info.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.373  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/autoconfig || /autoconfig.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.375  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/heapdump || /heapdump.json],methods=[GET],produces=[application/octet-stream]}" onto public void org.springframework.boot.actuate.endpoint.mvc.HeapdumpMvcEndpoint.invoke(boolean,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) throws java.io.IOException,javax.servlet.ServletException
2017-01-28 17:37:35.378  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/beans || /beans.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.384  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/env/{name:.*}],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EnvironmentMvcEndpoint.value(java.lang.String)
2017-01-28 17:37:35.384  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/env || /env.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.385  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/health || /health.json],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(java.security.Principal)
2017-01-28 17:37:35.387  INFO 4311 --- [  restartedMain] o.s.b.a.e.mvc.EndpointHandlerMapping     : Mapped "{[/mappings || /mappings.json],methods=[GET],produces=[application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-01-28 17:37:35.653  INFO 4311 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2017-01-28 17:37:35.832  INFO 4311 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-01-28 17:37:35.850  INFO 4311 --- [  restartedMain] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 0
2017-01-28 17:37:36.111  INFO 4311 --- [  restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-01-28 17:37:36.119  INFO 4311 --- [  restartedMain] c.i.s.StudentServicesApplication         : Started StudentServicesApplication in 8.193 seconds (JVM running for 10.023)

Complete Code Example

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.in28minutes.springboot</groupId>
	<artifactId>student-services</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>student-services</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.3.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

src/main/java/com/in28minutes/springboot/StudentServicesApplication.java

package com.in28minutes.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class StudentServicesApplication {

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

src/main/resources/application.properties


src/test/java/com/in28minutes/springboot/StudentServicesApplicationTests.java

package com.in28minutes.springboot;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentServicesApplicationTests {

	@Test
	public void contextLoads() {
	}

}

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