{title:'Overview', created:'8.0.0', updated:'9.0.0'}

The Juneau REST servlet APIs are designed to work seemlessly with the Spring Boot framework. The only restriction is that your top-level REST resource must extend from one of the following classes:

- {@link oajr.springboot}
  - {@link oajr.springboot.BasicSpringRestServlet} - Basic servlet
  - {@link oajr.springboot.BasicSpringRestServletGroup} - Basic servlet group

These classes are the equivalent to the {@link oajr.servlet.BasicRestServlet} and {@link oajr.servlet.BasicRestServletGroup} except they hook into the injection framework of Spring Boot to provide resolution of beans (e.g. child resources, various configuration classes).

The org.apache.juneau.examples.rest.springboot package and org.apache.juneau.examples.rest.springboot.App application are a basic Spring Boot application that shows off simple Juneau examples including injection beans.

| @SpringBootApplication | @Controller | public class App { | | //Entry point method. | public static void main(String[] args) { | new SpringApplicationBuilder(App.class).run(args); | } | | // Our root REST bean. | // Note that this must extend from {@link oajr.springboot.SpringRestServlet} to allow use of injection. | // All REST objects are attached to this bean using the {@link oajr.annotation.Rest#children()} annotation. | @Bean | public RootResources getRootResources() { | return new RootResources(); | } | | // Registers our REST bean at the URI root. | @Bean | public ServletRegistrationBean<Servlet> getRootServlet(RootResources rootResources) { | return new ServletRegistrationBean<>(rootResources, "/*"); | } | | // Injected child resource. | @Bean | public HelloWorldResource getHelloWorldResource() { | return new HelloWorldResource(); | } | | // Injected child bean used in injected child resource. | @Bean | public HelloWorldMessageProvider getHelloWorldMessageProvider() { | return new HelloWorldMessageProvider("Hello Spring injection user!"); | } | }

Our root resource servlet serves as a router page. It is defined as follows:

| @Rest( | title="Root resources", | description="Example of a router resource page.", | children={ | HelloWorldResource.class, | DtoExamples.class, | UtilityBeansResource.class, | HtmlBeansResource.class, | ConfigResource.class, | ShutdownResource.class | } | ) | @HtmlDocConfig( | widgets={ | ContentTypeMenuItem.class | }, | navlinks={ | "api: servlet:/api", | "stats: servlet:/stats", | "$W{ContentTypeMenuItem}", | "source: $C{Source/gitHub}/org/apache/juneau/examples/rest/$R{servletClassSimple}.java" | }, | aside={ | "<div class='text'>", | " <p>This is an example of a 'router' page that serves as a jumping-off point to child resources.</p>", | " <p>Resources can be nested arbitrarily deep through router pages.</p>", | " <p>Note the <span class='link'>API</span> link provided that lets you see the generated swagger doc for this page.</p>", | " <p>Also note the <span class='link'>STATS</span> link that provides basic usage statistics.</p>", | " <p>Also note the <span class='link'>SOURCE</span> link on these pages to view the source code for the page.</p>", | " <p>All content on pages in the UI are serialized POJOs. In this case, it's a serialized array of beans with 2 properties, 'name' and 'description'.</p>", | " <p>Other features (such as this aside) are added through annotations.</p>", | "</div>" | }, | asideFloat="RIGHT" | ) | @SerializerConfig( | quoteChar="'" | ) | public class RootResources extends BasicSpringRestServletGroup { | private static final long serialVersionUID = 1L; | }

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The org.apache.juneau.examples.rest.springboot.HelloWorldResource class shows an example of a child resource defined as an injected bean.

| @Rest( | title="Hello World", | description="An example of the simplest-possible resource", | path="/helloWorld" | ) | @HtmlDocConfig( | aside={ | "<div style='max-width:400px' class='text'>", | " <p>This page shows a resource that simply response with a 'Hello world!' message</p>", | " <p>The POJO serialized is a simple String.</p>", | "</div>" | } | ) | public class HelloWorldResource extends BasicRestObject { | | @Autowired | private HelloWorldMessageProvider messageProvider; | | @RestGet(path="/*", summary="Responds with injected message") | public String sayHello() { | return messageProvider.get(); | } | }

Note that the message rendered is coming from our injected message provider:

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