Empty @RequestMapping method should match both "" and "/" consistently

[bclozel]

See spring-projects/spring-boot#33499 for initial report. It looks like the enhancement in #29625 was incomplete.

The goal was to make the following work for both http://localhost:8080 and http://localhost:8080/:

@RestController
public class HomeController {

    @GetMapping
    public String home() {
        return "Hello, World!";
    }

}

But this use case doesn't work still, as the fix was focusing on the combining of @RequestMapping annotations. In the code snippet above, org.springframework.web.servlet.mvc.condition.PathPatternsRequestCondition#combine is never called as org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#getMappingForMethod will only call it if the RequestMappingInfo is available on the type. Here, it's null so the combination never happens.

#29625 did change the following, when the controller type itself is annotated with @RequestMapping.

@RestController
@RequestMapping
public class HomeController {

    @GetMapping
    public String home() {
        return "Hello, World!";
    }

}

[BrijeshPatra]

if you want a method annotated with @RequestMapping to match both "" (empty path) and "/" (root path), you can specify both values in the value or path attribute of the annotation, separated by a comma. For example:

@RequestMapping(value = {"", "/"}, method = RequestMethod.GET)
public String myMethod() {
// method implementation
}
In the above example, the myMethod method will handle requests to both the empty path and the root path.

[bclozel]

@BrijeshPatra thanks but this is not a question, but rather a behavior change that the team wants to make.

[BrijeshPatra]

Oh okay! Thanks for your reply actually i want to contribute in this project can you please guide me here.
@bclozel