rest - Postman : Required request part 'file' is not present -

i wanted upload image rest api through postman. using spring boot framework. here screen shot :

i have not set any headers found in other stack overflow answers gave multipart boundary error.

now, below controller code :

package com.practice.rest.assignment1.controller;  import java.io.ioexception; import java.util.list; import org.springframework.beans.factory.annotation.autowired; import org.springframework.web.bind.annotation.pathvariable; import org.springframework.web.bind.annotation.requestbody; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestmethod; import org.springframework.web.bind.annotation.requestparam; import org.springframework.web.bind.annotation.restcontroller; import org.springframework.web.multipart.multipartfile; import com.practice.rest.assignment1.model.product; import com.practice.rest.assignment1.service.catalogueservice; import org.codehaus.jackson.jsonparseexception; import org.codehaus.jackson.map.jsonmappingexception; import org.codehaus.jackson.map.objectmapper;  @restcontroller @requestmapping("/cataloguecontroller/") public class cataloguecontroller{      @autowired     private catalogueservice catalogueservice;      @requestmapping(value = "addproduct", method = requestmethod.post , consumes = "multipart/form-data")     public product addproduct(@requestparam string productjson, @requestparam multipartfile file) throws jsonparseexception, jsonmappingexception, ioexception {           product product = new objectmapper().readvalue(productjson, product.class);         byte[] mediabytes = file.getbytes();         product.setimage(mediabytes);         return catalogueservice.saveindb(product);      }  } 

now, taking product object consists internally image defined byte[] array. take string , image separately multipart file.

below product class attributes defined :

    private long pid;     private string model;     private string brand;     private byte[] image; // want image save     private long price;     private string currency;     private string transmissiontype;     private string fueltype; 

since , using spring boot , here main class :

package com.practice.rest.assignment1;  import org.springframework.boot.springapplication; import org.springframework.boot.autoconfigure.springbootapplication;   @springbootapplication public class app {    public static void main(string[] args) {       springapplication.run(app.class, args);     }  } 

the error on postman :

{   "timestamp": 1478611635977,   "status": 400,   "error": "bad request",   "exception": "org.springframework.web.multipart.support.missingservletrequestpartexception",   "message": "required request part 'file' not present",   "path": "/cataloguecontroller/addproduct" } 

where wrong ?

i think problem lies in json parameter sending. in postman don't need put starting , trailing " represent parameter string. , if use starting , ending " inside json( mean json object properties key , value) should use '(single quote).