POST and REST

[Alex Escalante]

Hello friends!

I am trying to build a solution around REST support under Spring 3.0 M3. So far, I have had no problems using GET method, but I can't find how to process a POST. This is how my method looks:

@RequestMapping(value = "/registry/configureService", method = RequestMethod.POST)
	public ModelAndView configureService(@RequestBody String instanceName, @RequestBody String className, @RequestBody String options) {
		log.debug("configuring:" + instanceName + ", " + className + ", " + options);
		...
	}

I understand that, according to the manual, there is the need for MessageConverters. I believe the most common of them are pre-registered by Spring. But even if I register my owns on my context, I still keep getting the error:

(415) Unsupported Media Type

This is how I tried to register some message converters:

<bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
      <list>
        <ref bean="stringHttpMessageConverter"/>
        <ref bean="formHttpMessageConverter"/>
      </list>
    </property>
  </bean>
  
  <bean id="formHttpMessageConverter"
    class="org.springframework.http.converter.FormHttpMessageConverter"/>
  
  <bean id="stringHttpMessageConverter"
    class="org.springframework.http.converter.StringHttpMessageConverter"/>

The request body I am posting in this case is a form (Content-Type: application/x-www-form-urlencoded).

Do you have any idea of what is going wrong?

Thanks in advance,
Alex

[Alex Escalante]

I found my answer through debugging.

There is no need to register all those beans. Some basic converters are registered by default, and the one I needed (to convert forms) is there.

What happens then is that only one @RequestBody can appear per signature. And for HTTP forms, the type of the parameter has to be MultiValueMap, so the signature for my method ends up being:

@RequestMapping(value = "/registry/configureService", method = RequestMethod.POST)
public ModelAndView configureService(@RequestBody MultiValueMap<String, Object> params) {
		
		for (String key : params.keySet()) {
			log.debug("key: " + key);
			log.debug("value: " + params.get(key));
		}
}

Maybe this could be better documented. Is either that or I should read better!

[kavya]

I have upgraded my porject to user spring3.0.0.M2. First I have started implementing REST support.I have modified my controller code like this.

@RequestMapping(value="/{userName}", method = RequestMethod.PUT)
public ModelAndView processPut(
@PathVariable("userName") String userName,
@RequestParam("userId")String userId,
@ModelAttribute("Details") Details details, HttpServletResponse response) {
.........
.........
ModelAndView(ViewNames.USER_DETAILS_SUCCESSVIEW);
}

I have removed the bean definitions and mappings in my servlet.xml.

Then I am getting some url path not found errors.Then I have replaced my mappings in servlet.xml at the time I am getting "Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView "

Can you please help me out?

[kavya]

I have upgraded my porject to user spring3.0.0.M2. First I have started implementing REST support.I have modified my controller code like this.

@RequestMapping(value="/{userName}", method = RequestMethod.PUT)
public ModelAndView processPut(
@PathVariable("userName") String userName,
@RequestParam("userId")String userId,
@ModelAttribute("Details") Details details, HttpServletResponse response) {
.........
.........
ModelAndView(ViewNames.USER_DETAILS_SUCCESSVIEW);
}

I have removed the bean definitions and mappings in my servlet.xml.

Then I am getting some url path not found errors.Then I have replaced my mappings in servlet.xml at the time I am getting "Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView "

Can you please help me out?

Hi,
I did a mistake.I have removed the definitions in servlet.xml. And it works fine.