Spring CLI: Hello World example

Create HelloWorld.groovy file with below content.

HelloWorld.groovy

@RestController
class HelloWorld {

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

}

Execute the command ‘spring run HelloWorld.groovy’.

It starts the embedded tomcat server and deploy HelloWorld application.

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.1.RELEASE)

2018-04-20 13:27:36.397  INFO 17248 --- [       runner-0] o.s.boot.SpringApplication               : Starting application on INLN50911363A with PID 17248 (started by krishna in C:\Users\krishna\Documents\Study\Spring Boot\examples)
2018-04-20 13:27:36.409  INFO 17248 --- [       runner-0] o.s.boot.SpringApplication               : No active profile set, falling back to default profiles: default
2018-04-20 13:27:36.694  INFO 17248 --- [       runner-0] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@8382c0f: startup date [Fri Apr 20 13:27:36 IST 2018]; root of context hierarchy
2018-04-20 13:27:38.779  INFO 17248 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-04-20 13:27:38.816  INFO 17248 --- [       runner-0] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-04-20 13:27:38.817  INFO 17248 --- [       runner-0] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.29
2018-04-20 13:27:38.908  INFO 17248 --- [ost-startStop-1] org.apache.catalina.loader.WebappLoader  : Unknown loader org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@3ab33fdd class org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader
2018-04-20 13:27:38.974  INFO 17248 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-04-20 13:27:38.974  INFO 17248 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2284 ms
2018-04-20 13:27:39.219  INFO 17248 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-04-20 13:27:39.228  INFO 17248 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-04-20 13:27:39.229  INFO 17248 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-04-20 13:27:39.231  INFO 17248 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-04-20 13:27:39.232  INFO 17248 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-04-20 13:27:39.450  INFO 17248 --- [       runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-20 13:27:39.822  INFO 17248 --- [       runner-0] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@8382c0f: startup date [Fri Apr 20 13:27:36 IST 2018]; root of context hierarchy
2018-04-20 13:27:39.931  INFO 17248 --- [       runner-0] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String HelloWorld.home()
2018-04-20 13:27:39.940  INFO 17248 --- [       runner-0] 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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-04-20 13:27:39.943  INFO 17248 --- [       runner-0] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-04-20 13:27:39.999  INFO 17248 --- [       runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-20 13:27:40.002  INFO 17248 --- [       runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-20 13:27:40.531  INFO 17248 --- [       runner-0] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-04-20 13:27:40.601  INFO 17248 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-04-20 13:27:40.609  INFO 17248 --- [       runner-0] o.s.boot.SpringApplication               : Started application in 5.284 seconds (JVM running for 8.153)

Open browser hit the url  ‘http://localhost:8080/’ in browser, you can able to see ‘Hello World!’ message.

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