CODEWITHSUNDEEP
javaspringspring-mvcspring-boot
NeeruKSingh
NeeruKSingh

Reputation: 1575

Spring MVC @Path variable with null value

enter image description hereAm developing an application using spring boot. In Resource am using path variable(**@PathVariable** annotation) and Request Param(**@RequestParam("name")** annotation). My code fetching the request param value but not the path variable value,I am getting the path variable value as null. Please any one suggest me to solve this issue.

@RequestMapping(value = "/api/user/{id}", method = RequestMethod.GET)  
public void get(@RequestParam("name")  String name, @PathVariable Integer id); {

        System.out.println("name="+name);
        System.out.println("id="+id)
}

URL:
http://localhost:8080/api/user/2?name=neeru

OUTPUT:
name=neeru
id=null

i also tried 

**@RequestMapping(value = "/api/user/id={id}", method = RequestMethod.GET)**

URL:
http://localhost:8080/api/user/id=2?name=neeru but getting same id value=null

i have added one more method -only has @PathVariable 

@RequestMapping(path="/api/user/name/{name}", method = RequestMethod.GET)    
   void get( @PathVariable("value=name") String name){

   System.out.println("name="+name)
}

but result is same path variable value name=null

Upvotes: 2

Views: 16266

Answers (2)

Rahul Vashishta
Rahul Vashishta

Reputation: 184

  1. @PathVariable is to obtain some placeholder from the uri
  2. @RequestParam is to obtain an parameter

Change your endpoint like this

http://localhost:8080/api/user/2/users?name=neeru

`

@RequestMapping(value = "api/user/{id}/users", method = RequestMethod.GET)  
public void get(@RequestParam("name")  String name, @PathVariable("id") Integer id); {
        System.out.println("name="+name);
        System.out.println("id="+id)
}

`

Output:

name = neeru

id = 2

enter image description here

enter image description here

enter image description here

Upvotes: 6

Simon Martinelli
Simon Martinelli

Reputation: 36103

@PathVariable is used for extracting variables in the path like MystyxMac suggested. If you want to extract query parameters then you must use @RequestParam

But your example is a mix of path and query parameter.

You cannot use = in an URL because this is a reserved character: https://www.w3.org/Addressing/URL/url-spec.txt

So either use 

/api/user/{id} with @PathVariable

or 

/api/user?id={id} with @RequestParam

Upvotes: 5

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