Spring MVC - HandlerMapping Examples

@Configuration
@ComponentScan
@EnableWebMvc
public class AppConfig implements WebMvcConfigurer {

    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        UrlPathHelper urlPathHelper = new UrlPathHelper();
        urlPathHelper.setAlwaysUseFullPath(true);
        configurer.setUrlPathHelper(urlPathHelper);
    }
}

@Configuration
@ComponentScan
public class AppConfig extends WebMvcConfigurationSupport {

    @Bean
    @Override
    public RequestMappingHandlerMapping requestMappingHandlerMapping(
            @Qualifier("mvcContentNegotiationManager")
            ContentNegotiationManager contentNegotiationManager,
            @Qualifier("mvcApiVersionStrategy") @Nullable
            ApiVersionStrategy apiVersionStrategy,
            @Qualifier("mvcConversionService")
            FormattingConversionService conversionService,
            @Qualifier("mvcResourceUrlProvider")
            ResourceUrlProvider resourceUrlProvider) {

        // Fetch the default instance constructed by Spring
        RequestMappingHandlerMapping m = super.requestMappingHandlerMapping(
                contentNegotiationManager,
                apiVersionStrategy,
                conversionService,
                resourceUrlProvider
        );
        m.setDefaultHandler(new MyDefaultHandler());
        return m;
    }
}

@EnableWebMvc
@Configuration
public class AppConfig {

    @Bean
    HttpRequestHandler httpRequestHandler () {
        return new MyHttpRequestHandler();
    }

    @Bean
    public SimpleUrlHandlerMapping simpleUrlHandlerMapping () {
        SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
        Map<String, Object> map = new HashMap<>();
        map.put("/app/**", httpRequestHandler());
        mapping.setUrlMap(map);
        return mapping;
    }
}