Default Imports

Spring CLI automatically imports many libraries by default so that explicit imports are not required. Consider the following groovy script.

@RestController
class FirstApplication {
   @RequestMapping("/")
   String welcome() {
      "Welcome to TutorialsPoint.Com"
   }
}

Here import for @RestController, @RequestMapping annotations are already included by default by Spring Boot. We”re not even require to use fully-qualified names. You can check by running the application.

Type the following command

E:/Test/> spring run FirstApplication.groovy

You can see the following output on console.

  .   ____          _            __ _ _
 /\ / ___''_ __ _ _(_)_ __  __ _    
( ( )___ | ''_ | ''_| | ''_ / _` |    
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  ''  |____| .__|_| |_|_| |___, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.3)

2022-02-03 11:29:01.177  INFO 10668 --- [       runner-0] o.s.boot.SpringApplication               : Starting application using Java 11.0.11 on DESKTOP-86KD9FC with PID 10668 (started by intel in F:Test)
2022-02-03 11:29:01.187  INFO 10668 --- [       runner-0] o.s.boot.SpringApplication               : No active profile set, falling back to default profiles: default
2022-02-03 11:29:03.555  INFO 10668 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-02-03 11:29:03.591  INFO 10668 --- [       runner-0] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-02-03 11:29:03.592  INFO 10668 --- [       runner-0] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-03 11:29:03.659  INFO 10668 --- [       runner-0] org.apache.catalina.loader.WebappLoader  : Unknown class loader [org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@8646db9] of class [class org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader]
2022-02-03 11:29:03.735  INFO 10668 --- [       runner-0] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-02-03 11:29:03.736  INFO 10668 --- [       runner-0] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2107 ms
2022-02-03 11:29:04.945  INFO 10668 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''''
2022-02-03 11:29:04.968  INFO 10668 --- [       runner-0] o.s.boot.SpringApplication               : Started application in 4.811 seconds (JVM running for 8.805)

Automatic Main Method

We are not required to create standard main method for groovy script to initialize a spring application. It is automatically created for spring boot application.