Spring boot hello world example
Directory Structure
pom.xml file
Modify auto created POM file. We need to add parent in pom to make it a spring boot application. After that add spring-boot-starter-web dependency and java version.
4.0.0 codesjava SpringBoot01 0.0.1-SNAPSHOT jar SpringBoot01 http://maven.apache.org 1.8 org.springframework.boot spring-boot-starter-parent 1.4.2.RELEASE org.springframework.boot spring-boot-starter-web junit junit 3.8.1 test
Now, right click on project -> click on Maven -> click on update project -> Popup window will open -> click Ok to update the project.
It is a initializer class which runs a SpringApplication.
package com.w3schools360;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
public static void main( String[] args ) {
SpringApplication.run(App.class, args);
}
}
On console
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.4.2.RELEASE)
2018-04-30 23:56:45.653 INFO 12576 --- [ main] com.w3schools360.App : Starting App on INDEL-L-28V8JC2 with PID 12576 (started by jsingh in D:\Spring Security\SpringBoot01)
2018-04-30 23:56:45.670 INFO 12576 --- [ main] com.w3schools360.App : No active profile set, falling back to default profiles: default
2018-04-30 23:56:45.776 INFO 12576 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@70e8f8e: startup date [Mon Apr 30 23:56:45 IST 2018]; root of context hierarchy
2018-04-30 23:56:47.757 INFO 12576 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2018-04-30 23:56:47.778 INFO 12576 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2018-04-30 23:56:47.779 INFO 12576 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.6
2018-04-30 23:56:48.000 INFO 12576 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-04-30 23:56:48.000 INFO 12576 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2231 ms
2018-04-30 23:56:48.218 INFO 12576 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-04-30 23:56:48.234 INFO 12576 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-04-30 23:56:48.234 INFO 12576 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-04-30 23:56:48.234 INFO 12576 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-04-30 23:56:48.234 INFO 12576 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-04-30 23:56:48.503 INFO 12576 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@70e8f8e: startup date [Mon Apr 30 23:56:45 IST 2018]; root of context hierarchy
2018-04-30 23:56:48.581 INFO 12576 --- [ main] 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)
2018-04-30 23:56:48.581 INFO 12576 --- [ main] 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)
2018-04-30 23:56:48.596 INFO 12576 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-30 23:56:48.612 INFO 12576 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-30 23:56:48.643 INFO 12576 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-30 23:56:48.754 INFO 12576 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-04-30 23:56:48.832 INFO 12576 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-04-30 23:56:48.848 INFO 12576 --- [ main] com.w3schools360.App : Started App in 3.777 seconds (JVM running for 4.394)
