Mapping Jackson Json View

[karthik0415]

Hi.

I am new here. Can you please give me the code for a sample Spring MVC app using mappingjacksonjsonview to give JSON result to the view..

Also would appreciate if you can provide me a jsp view to read the JSON output.

Thanks

Karthik

[Pranav Kumar Varshney]

Check this -

http://blog.springsource.com/2010/01...in-spring-3-0/

[karthik0415]

Thanks Pranav.

The app i am dev requires MappingJacksonJsonView to be used a as a bean to convert a model map into a JSON object... I read many articles which says this is possible, but nothing is clear on how...

My code is smthing like this:

A simformcontroller:

return new ModelAndView("jsonView", modelMap);

And:

<bean name="jsonView" class="org.springframework.web.servlet.view.json.M appingJacksonJsonView">
<property name="prefixJson" value="true"/>
</bean>

Is this supposed to work?? Or Am i missing something?

[Pranav Kumar Varshney]

No need of doing all these. Spring 3.0 has excellent support for AJAX / JSON. Use mvc:annotation-driven configuration and put Jackson jars in the classpath. Read the link that I sent earlier for more details.

Sample code -

Controller -

@RequestMapping("/getJSON")
	public @ResponseBody
	User getUser(@RequestParam String name) {
		User user = new User();
		user.setAge(30);
		user.setName(name);

		return user;
	}

servlet.xml -

   <context:component-scan base-package="com.test.controller"/>
   <context:annotation-config />

   <mvc:annotation-driven />

I am using jquery to make AJAX call and get the JSON object

    $.getJSON("/sr/getJSON.action", { name: "Pranav" }, function(user) {
		alert (user.name);
		alert(user.age);
     });

[jaykhimani]

No need of doing all these. Spring 3.0 has excellent support for AJAX / JSON. Use mvc:annotation-driven configuration and put Jackson jars in the classpath. Read the link that I sent earlier for more details.

Sample code -

Controller -

@RequestMapping("/getJSON")
	public @ResponseBody
	User getUser(@RequestParam String name) {
		User user = new User();
		user.setAge(30);
		user.setName(name);

		return user;
	}

servlet.xml -

   <context:component-scan base-package="com.test.controller"/>
   <context:annotation-config />

   <mvc:annotation-driven />

I am using jquery to make AJAX call and get the JSON object

    $.getJSON("/sr/getJSON.action", { name: "Pranav" }, function(user) {
		alert (user.name);
		alert(user.age);
     });

Does @ResponseBody also work for the methods annotated with @ExceptionHandler? At least for me this is not working. What I'm trying is, I'm writing RESTful/JSON service using Spring 3 MVC. For all happy scenarios, each operation returns me proper JSON response using @ResponseBody. But there will be some scenarios where there are some un-caught exceptions. To handle such scenarios, I've annotated a method with @ExceptionHandler annotation and returning a POJO which will have error code, error desc and annotated as @ResponseBody. But somehow this does not work. Any idea whats going wrong over here?

Below is the indicative signature for the exception handler method...

@ExceptionHandler( Exception.class )
public @ResponseBody ErrorDetails handleUncaughtExceptions( Exception ex, HttpServletRequest req )



Regards,
- Jay

[trekmbikes]

https://jira.springsource.org/browse/SPR-6902

This is fixed in 3.1M1 - I just tested it.

[bipulsinha]

Hi,

I am trying to send JSON response to my dojo widget. I have added <mvc:annotationdriven/> tag in my configuration file. Here is the code snippet which I am using:
@RequestMapping("/getBrandJSON.htm")
public @ResponseBody List<Brand> getBrand(){
List<Brand> brandList = new ArrayList<Brand>();
brandList = (List<Brand>) brandService.getBrandList();
return brandList;
}

However, when I hit this using URL it result to an exception HttpMediaTypeNotAcceptableException: Could not find acceptable representation.

The jackson-all-1.8.5.jar is added to my classpath.

I am facing this issue and unable to resolve it.

Please someone help.

Regards,

Bipul Sinha.

[bipulsinha]

Hi,

The problem is almost resolved now. I have upgraded my jars from 3.0.0 to 3.1 and now I am able to view JSON response but unfortunately on the browser only. Just <mvc:anotationdriven/> and ackson-all jar works for me.

However, the DOJO widget doesn't get populated with data .

I believed that since it is because of Null ModelAndView returned to DispatcherServlet. Could someone confirm whether I am thinking on the right direction or not?

Thanks in advance,

Bipul Sinha.

[edintonucretia]

Below is the indicative signature for the exception handler method

[ewpreston]

I tried this with Spring MVC 3.1 and Jackson 2.0 and it doesn't work. When I use the Jackson 1.9 jars it works. Any chance Jackson and Spring can work together to keep things in sync or do a better job of documenting exactly what versions works with which? Just saying "get jackson" isn't terribly helpful