Spring-Boot / Groovy / MVC “Hello World” example

The complete project can be found here:
https://github.com/mtrojahn/spring-boot-groovy-mvc-simple

This is yet another very basic example. This time I’ll show how to create get a Web-MVC Spring-Boot project started. You will notice I take the no-XML approach and I’ll try to keep my examples as XML-free as they can be because it’s hard to find fresh documentation about it on the Web.

So, let me start with the build.gradle file:

As you can see, no big changes from my previous example. Basically all you have to do is change spring-boot-starter to spring-boot-starter-web.

Ok, now let’s have a look on the our main class:

I didn’t use @SpringBootApplication this time because I wanted to add a little configuration to it:

The @EnableAutoConfiguration annotation tells Spring-Boot to configure beans based on what it sees on my classpath. It will see spring-webmvc and flag this as a web application. Spring-Boot will provide you an embedded Tomcat server that will listen on port 8080 as default, among other things.

@ComponentScan configures the scanning for @Configuration classes and in this case it’s telling Spring to scan the package that holds my MVC Controller.

Here’s the MVC Controller:

This @Controller will just show the traditional “Hello World!” message when you point your browser to “http://localhost:8080/”. The @RequestMapping annotation is responsible for mapping the URL “/” to the method “hello()” which just returns a string.

That’s it, folks.

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