Java configuration of SimpleUrlHandlerMapping (Spring boot) - spring

Question

I have an existing Spring web application, that uses two controllers, which extend AbstractController. I want to integrate Spring Boot into the application, so that we can run it as a standalone application.
I am facing a problem, because Spring is not forwarding the calls to my controller. How can I map the controller to an URL pattern like "/app/*"?
SampleController.java
#Controller("myController")
public class SampleController extends AbstractController {
#Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
response.getWriter().print("Hello world!");
return null;
}
}
Application.java
#EnableAutoConfiguration
#Configuration
#ComponentScan
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
#Bean
public SimpleUrlHandlerMapping sampleServletMapping() {
SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
Properties urlProperties = new Properties();
urlProperties.put("/index", "myController");
mapping.setMappings(urlProperties);
return mapping;
}
}
When I start the application I get the following message:
INFO [org.springframework.web.servlet.handler.SimpleUrlHandlerMapping] Mapped URL path [/index] onto handler 'myController'
But when I send a request to /index, I get following messages:
DEBUG [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping] Looking up handler method for path /index
DEBUG [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping] Did not find handler method for [/index]
DEBUG [org.springframework.web.servlet.handler.SimpleUrlHandlerMapping] Matching patterns for request [/index] are [/**]
DEBUG [org.springframework.web.servlet.handler.SimpleUrlHandlerMapping] URI Template variables for request [/index] are {}
DEBUG [org.springframework.web.servlet.handler.SimpleUrlHandlerMapping] Mapping [/index] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.ResourceHttpRequestHandler#11195d3e] and 1 interceptor

Answer 1

SimpleUrlHandlerMappings are ordered and, as described in the javadoc the default is Integer.MAX_VALUE which means that they have the lowest possible precedence. This causes ResourceHttpRequestHandler (which is mapped to /** and has an order of Integer.MAX_VALUE - 1 by default) to take precedence over the mapping for your controller.
Update your sampleServletMapping() method to set your mapping's order to a value that's less than Integer.MAX_VALUE - 1. For example:
#Bean
public SimpleUrlHandlerMapping sampleServletMapping() {
SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
mapping.setOrder(Integer.MAX_VALUE - 2);
Properties urlProperties = new Properties();
urlProperties.put("/index", "myController");
mapping.setMappings(urlProperties);
return mapping;
}