No adapter for handler : The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler

Question

We are migrating from spring 4.x to spring 5.2.13 version. In spring 4 this was working but in spring 5.x we are getting the below error for dispatcher servlet

javax.servlet.ServletException: No adapter for handler : The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler at

Can anyone help me , what i am missing here? I am migrating from spring 4.x to spring 5.2.13

Lumbard

what about formatting your question to make it readable? – Ping

Sorry about the formatting, i did formatted my question again – Lumbard

Answer 1

change the following:

@Controller
@RequestMapping

to this:

@Controller

i.e. Remove the @RequestMapping annotation from the class; it provides no value.

Gibbons

I tried removing the @RequestMapping but still getting error – Lumbard

Answer 2

This can happens when there is root URL path ("/") in a Spring MVC controller.

In one of the controllers add a @GetMapping("/")

Ex :

@RestController("/")
public class UserController {

    @GetMapping("/")
    public String welcomeUser() {
        return "<h1> Welcome</h1>";
    }

}

Madore

Answer 3

You probably need to specify a mapping for @RequestMapping like @RequestMapping('/')

Ping

I did try that , but that was not useful still getting this error – Lumbard

@nandanpandey the error is somewhere else then – Ping

Answer 4

I was able to resolve the issue by using mvc:annotation-driven/ in dispatcher xml.

AnnotationMethodHandlerAdapter is removed from Spring 5. So when migrating from Spring 4.x to Spring 5.2.13 I was getting the Adaptor issue.

Lumbard

Answer 5

You need to add both:

@RestController /or @Controller @RequestMapping("your path")

Scarletscarlett