Spring MVC @Path variable with null value

Question

Am 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

yes,i tried api/user/id={id}?name=abc but getting same null value for id — NeeruKSingh
– NeeruKSingh, Commented Oct 25, 2017 at 9:17
Set a name for the pathvariable like @PathVariable(name="id") so it can get resolved.. — mrkernelpanic
– mrkernelpanic, Commented Oct 25, 2017 at 9:33
yes tried @PathVariable(name="id") and also @PathVariable(value="id") ,both are not working — NeeruKSingh
– NeeruKSingh, Commented Oct 25, 2017 at 9:38
You have a typo... should be @PathVariable(value="name") and not @PathVariable("value=name") — mrkernelpanic
– mrkernelpanic, Commented Oct 25, 2017 at 10:09

Rahul Vashishta · Accepted Answer · 2017-10-25 10:24:46Z

6

@PathVariable is to obtain some placeholder from the uri
@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

edited Oct 25, 2017 at 10:24

answered Oct 25, 2017 at 9:50

Rahul Vashishta

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4 Comments

NeeruKSingh Over a year ago

not working tried,@RequestMapping(path="api/user/{id}/users", method = RequestMethod.GET) void get(@RequestParam("name") String name, @PathVariable("id") Integer id); and url : localhost:8080/api/user/id/2/users?name=neeru

NeeruKSingh Over a year ago

may be,sorry but not working for me. here is also a ex stackoverflow.com/questions/26794198/… . i have done same ,but dont know why its not working

NeeruKSingh Over a year ago

see my question ,i have attached screenshot,tell me where m doing mistake

NeeruKSingh Over a year ago

thanks,actually i had UserResource interface and UserResourceImpl class ,In spring boot PathVariable annotation is not inherited from interface, i was using @PathVariable at interface thats why is was not working but now m using PathVariable annotation at UserResouceImpl as well,now its working for me.

Simon Martinelli · Accepted Answer · 2017-10-25 09:19:26Z

5

@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

answered Oct 25, 2017 at 9:19

Simon Martinelli

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3 Comments

NeeruKSingh Over a year ago

m trying /api/user/{id} with @PathVariable but getting null value for id,dont know why i am getting path variable value as null

Dilini Peiris Over a year ago

im trying to write API test cases for scenarios like this. if the endpoint is called as /api/user/null should it give a client error (4xx) or a server error (5xx)?

Simon Martinelli Over a year ago

Always a 4xx becuase 5xx is server error that indicates that your application has an error

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