MethodArgumentTypeMismatchException in spring boot

user_9130164 0
Viewed 4818

I try to delete a user by getting id in url with an error:

Failed to convert value of type 'java.lang.String' to required type 'int'; 
nested exception is java.lang.NumberFormatException: For input string:

I change int id to String id, but then deleteMyUser() will not work because it accepts an integer.

Code:

<a href="/delete-user?id=${user.id}">x</a>


@RequestMapping("/delete-user{id}")
    public  String deleteUser(@PathVariable("id") int id,HttpServletRequest request)
    {   
        request.setAttribute("mode","MODE_HOME");
        userService.deleteMyUser(id);

        return "welcome";

    }
spring-boot request-mapping path-variables spring java
4 Answers

You should add the id to path, so remove ?id=:

<a href="/delete-user${user.id}">x</a>
user_72949000

The problem is you are confusing between "query parameter" and "path variable"

<a href="/delete-user?id=${user.id}">x</a> // Passing value as query param


@RequestMapping("/delete-user{id}") // Expecting Path variable

To Fix this, either change both to query param or path variable (here I changed to path variable):

<a href="/delete-user/${user.id}">x</a>



@RequestMapping("/delete-user/{id}")
    public  String deleteUser(@PathVariable("id") int id,HttpServletRequest request)
    {   
        request.setAttribute("mode","MODE_HOME");
        userService.deleteMyUser(id);

        return "welcome";

    }
user_97361840

Let me explain you some urls and there mapping

First /user/{id}/{userId} this is path variable format /user?id=1&userid=2 this is requestparam/query param format. 

https://domainname.com/find/user?id=1

@GetMapping("/find/user")
public  String deleteUser(@RequestParam("id") int id){   

}

https://domainname.com/find/user/1

@GetMapping("/find/user/{id}")
public  String deleteUser(@Pathvariable("id") int id){   

}

https://domainname.com/find/user/1/2
@GetMapping("/find/user/{id}/{userid}")
public  String deleteUser(@Pathvariable("id") int id,@Pathvariable("userId") 
int userId){   

}

** in case of pathvariable your variable are part of mapping

POST request

https://domainname.com/find/user
in request body {"id":1}

@PostMapping("/find/user")
public  String deleteUser(@RequestBody Integer id){   

}
https://domainname.com/find/user/1?userId=2
@GetMapping("/find/user/{id}")
public  String deleteUser(@Pathvariable("id") int id,@RequestParam("userId") 
int userId){   

}

if you are using @RequestMapping then its recommanded to define method also by default it map with get request.

@RequestMapping(method = [RequestMethod.GET])

user_101455110

What about this:

 RequestMapping("/delete-user/{id}")

Use a slash between delete-user and id and then call

<a href="/delete-user/${user.id}">x</a>

Also ensure that ${user.id} contains a valid number value

user_66025520
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