How to configure Spring MVC with pure Java-based configuration?

Question

I have, what I would consider a pretty simple Spring MVC setup. My applicationContext.xml is this:

Answer 1

Java-based configuration without adding any elements to web.xml. WebApplicationInitializer is a perfect fit for use with Spring's code-based @Configuration classes

WebApplicationInitializer « Interface to be implemented in Servlet 3.0+ environments in order to configure the ServletContext programmatically -- as opposed to (or possibly in conjunction with) the traditional web.xml-based approach. Implementations of this SPI will be detected automatically by SpringServletContainerInitializer, which itself is bootstrapped automatically by any Servlet 3.0 container. ^{Using Servlet Spec 3.0 of Tomcat 7}

From Spring 3.2 some Abstract class were listed which implemented WebApplicationInitializer which will be detected automatically by the SrevletContainer.

AbstractAnnotationConfigDispatcherServletInitializer extends
AbstractDispatcherServletInitializer extends
AbstractContextLoaderInitializer implements WebApplicationInitializer

Using Spring 4.1.6.RELEASE version with the modules core, web, webmvc, beans.

public class WebXML_DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class[] getRootConfigClasses() {
        return new Class[] { MvcServletXMLConfigurer.class };
    }

    @Override
    protected Class[] getServletConfigClasses() {
        return null;
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

}

Java-based configuration to Serve Static Resources with Spring. ^{Spring Boot}

@Configuration
@EnableWebMvc // 
@ComponentScan(value = {"com.github.yash777.controllers"})
// 
public class MvcServletXMLConfigurer extends WebMvcConfigurerAdapter implements WebMvcConfigurer {

    /**
     * 
     * 
     * @return InternalResourceViewResolver as a bean configuration.
     */
    @Bean
    public InternalResourceViewResolver getInternalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/jsp/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        System.out.println("WebMvcConfigurer - addResourceHandlers() function get loaded...");

        // 
        registry
            .addResourceHandler("/styles/**") 
            .addResourceLocations("/css/") // webapp/css/
            .setCachePeriod(3600)
            .resourceChain(true) // Spring 4.1
            .addResolver(new GzipResourceResolver()) // Spring 4.1
            .addResolver(new PathResourceResolver()); // Spring 4.1

        // 
        registry.addResourceHandler("/static/**")
                .addResourceLocations("/static/", "classpath:/static/") // src/main/resources/static/
                .setCachePeriod(3600)
                .resourceChain(true)
                .addResolver(new PathResourceResolver());
    }
}

Listed a sample controller:

@Controller
@RequestMapping(value = { "/controller", "/c" })
public class Test extends HttpServlet {
    private static final long serialVersionUID = 1L;

    @RequestMapping(value = {"/message", "/m"}, method = RequestMethod.GET )
    public void message(HttpServletRequest request, HttpServletResponse response ) throws IOException {
        System.out.println("@Controller Get method called.");
    }

    @RequestMapping(value = "/getView", method = RequestMethod.GET )
    public ModelAndView setViewName( Model model ) {
        System.out.println("GET... /getView");
        ModelAndView mav = new ModelAndView();
        mav.setViewName("test");
        return mav;
    }
}

WEB-INF/web.xml

  Archetype Created Web Application