Introducing Spring Framework

Chapter 1 ■ Your First Spring Application
After executing the above command, you should see something like the following output:
spring run app.groovy
Resolving dependencies..
:: Spring Boot :: (v1.0.2.RELEASE)
INFO 84872 --- [main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
INFO 84872 --- [main] o.apache.catalina.core.StandardService : Starting service Tomcat
INFO 84872 --- [main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache
Tomcat/7.0.52
INFO 84872 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring
embedded WebApplicationContext
INFO 84872 --- [ost-startStop-1] o.s.web.context.ContextLoader
: Root
WebApplicationContext: initialization completed in 2030 ms
INFO 84872 --- [main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080/http
INFO 84872 --- [main] c.a.isf.spring.HelloWorldController : Started HelloWorldController in
7.086 seconds (JVM running for 7.599)
> Building 80% > :ch01:run
Now you can go to any web browser and type in the URL http://localhost:8080, and you should see the same
as Figure 1-3. The Spring Boot will know what to do when it’s running the app.groovy file. It will create a web context
and response to any request based on the annotations provided.
Summary
In this chapter, you saw how to create a simple Spring “Hello World” application and run it. You also learned how
Spring uses dependency injection to create all the dependencies and collaboration between classes. Thanks to the
small example, you saw that it doesn’t matter what implementation you create, as long as you follow the interface,
Spring will inject its implementation and have it ready when you need it.
You got a small sneak peek of the Spring Boot, a new project by the Spring Team that will be covered in the
following chapters. You also saw how Spring plays well with the Groovy programming language.
The following chapters will cover more detail of the Spring Framework, its features, and its Extensions. You’ll
learn how they work together and how they can be used in your daily development.
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