Spring mvc request mapping for POST JSON request not working.

[Sunny Mattas]

Hello All,
In our spring web application we are getting AJAX JSON request and I have to do the request mapping in controller.
Following is the structure of my request form data sent to the server.

product[0][id]:423243233
products[0][quantity]:5000.0
products[0][unit]: test

Following is the request mapping I have done in the controller.

    @RequestMapping(value = "/addProducts", method = RequestMethod.POST, headers = "Accept=application/json")
    @ResponseBody
    public B2bProductData addMultipleArticlesTocart(@RequestBody final List<ProductForm> products, final Model model) 

public class ProductForm {
    public long id;
    public long quantity;
    public String unit;

    public long getId() {
        return id;
    }

    public void setId(final long id) {
        this.id = id;
    }

    public long getQuantity() {
        return quantity;
    }

    public void setQuantity(final long quantity) {
        this.quantity = quantity;
    }

    public String getUnit() {
        return unit;
    }

    public void setUnit(final String unit) {
        this.unit = unit;
    }

}

But I am getting the following error in the browser

415 Unsupported Media Type

Please let me know what is wrong with my request mapping. Thanks.

Regards,

[Bill Gorder]

Just a side note you should use the 'produces' and 'consumes' attributes of RequestMapping to define the Content-Type and Accept rather than the headers attribute. This was added in newer versions of Spring.

The likely culprit is one of 2 things:

-Either you do not have the Jackson type converter registered (should happen if you have used the annotation-config tag in the MVC namespace or the @EnableWebMvc annotation in your @Configuration file) IF the Jackson library is on your classpath.
-You have not set the Content-Type header on the incoming request to "application/json"

The easiest way to do some test posts is use the RestClient Firefox extension. Using this plugin you can post in some JSON and set the Content-Type header.
https://addons.mozilla.org/en-us/firefox/addon/restclient/

[H Paul]

OP,

Following Bill's advice. This is what I did to solve my json issue using Spring 3

1.a. Add

<mvc:annotation-driven/>

to applicationContext-mvc.xml

	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 

AND jackson json jar, for example WEB-INF\lib\jackson-all-1.9.11.jar. 

Then implicitly RequestMappingHandlerMapping will be registered/called/used.
Then MappingJacksonHttpMessageConverter will be called as it is registered.

3. Controller

consumes="application/json"

4. Fun to debug:

- The best is use a debugger and set breaking point on below classes and others
DispatcherServlet
RequestMappingHandlerMapping
MappingJacksonHttpMessageConverter

-have TCP/IP to see the request sent from the client to server: http headers + body

Content-Type: application/json;charset=UTF-8
and body in the json format.

-log4j.xml to watch log:

	<logger name="org.springframework.web">
		<level value="debug" />
	</logger>

	<logger name="org.springframework.web.servlet">
		<level value="debug" />
	</logger>