A controller showing unexpected behaviour when URI template variables have regex restrictions.

Application.java

package internal.sandbox.configuration;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;


/**
 * @author emerson
 */
@Configuration
@EnableAutoConfiguration
@ComponentScan("internal.sandbox")
public class Application {

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).run(args);
    }


    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

SomeController.java

package internal.sandbox.controller;


import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.MatrixVariable;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;


/**
 * @author emerson
 */
@Controller
public class SomeController {

    @RequestMapping(value = "/withoutRegex/{userId}")
    public ResponseEntity<?> getUser(@PathVariable long userId,
                            @MatrixVariable(pathVar = "userId") Map<String, List<String>> matrixVariables) {

        System.out.println(userId);
        System.out.println(matrixVariables);

        return new ResponseEntity<Object>(HttpStatus.OK);
    }

    @RequestMapping(value = "/withRegex/{userId:6}")
    public ResponseEntity<?>  getSpecificUser(@PathVariable long userId,
                            @MatrixVariable(pathVar = "userId") Map<String, List<String>> matrixVariables) {

        System.out.println(userId);
        System.out.println(matrixVariables);

        return new ResponseEntity<Object>(HttpStatus.OK);
    }
}

WebMvcConfiguration.java

package internal.sandbox.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;


/**
 * @author emerson
 */
@Configuration
public class WebMvcConfiguration extends DelegatingWebMvcConfiguration {

    @Override
    @Bean
    public RequestMappingHandlerMapping requestMappingHandlerMapping() {

        RequestMappingHandlerMapping mapping = super.requestMappingHandlerMapping();
        mapping.setRemoveSemicolonContent(false);

        return mapping;
    }
}