Spring MVC #RequestBody JSON - json

Question

I'm getting an error that the request sent by the client was syntactically incorrect. What is being done wrong? Here is my code:
#Entity
#Table(name = "display")
public class Display {
private String diagonal;
private String aspectRatio;
//getter and setter
}
$.ajax({
type:'POST',
url:'/admin/updateDisplay',
data:{'diagonal':"sss"}
})
#Controller
#RequestMapping(value = "/admin")
public class AdminController {
#RequestMapping(value = "/updateDisplay", method = RequestMethod.POST)
public String updateDisplay(#RequestBody Display display){
System.out.print(display);
return null;
}
}

Answer 1

I think you need to say what the service media type will consume for Spring to know how to unmarshall it. Probably application/json.
#RequestMapping(value = "/updateDisplay", method = {RequestMethod.POST},
consumes = {"application/json"})
Probably some Json library too, like Jackson.

Answer 2

Use the following:
$.ajax({
type:'POST',
url:'/admin/updateDisplay',
data:{"diagonal":"sss","aspectRatio":"0.5"},
contentType: 'application/json',
dataType: 'json',
})
it works.
EDIT
If you are booting up Spring application Context using annotaitons, then your config class must have:
#Override
protected void configureContentNegotiation(
ContentNegotiationConfigurer configurer) {
configurer.favorPathExtension(false).favorParameter(true)
.parameterName("mediaType").ignoreAcceptHeader(true)
.useJaf(false).defaultContentType(MediaType.APPLICATION_JSON)
.mediaType("xml", MediaType.APPLICATION_XML)
.mediaType("json", MediaType.APPLICATION_JSON);
}
And your ajax request must include
contentType: 'application/json',
dataType: 'json',
check the modified ajax call above.
If you are booting up spring application context using XMLs then use the below:
<bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="favorPathExtension" value="false" />
<property name="favorParameter" value="true" />
<property name="parameterName" value="mediaType" />
<property name="ignoreAcceptHeader" value="true"/>
<property name="useJaf" value="false"/>
<property name="defaultContentType" value="application/json" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
</map>
</property>
</bean>
For more details on writing RESTFUL webservices with Spring 3.2 see my blog

Answer 3

You must convert the JSON data to string before pass it to Spring MVC. So, here is the solution in your case:
$.ajax({
type:'POST',
url:'/admin/updateDisplay',
data: JSON.stringify({'diagonal':"sss"})
})

Answer 4

You don't need #RequestBody.
With #RequestBody Spring calls a converter that takes the whole request and converts it to an object of the required type. You send your data as application/x-www-form-urlencoded, which is the default of jQuery, and there is no built-in converter for that.
Without #RequestBody, when you send form data, spring creates an empty object and sets the properties based on the data you sent. So in your case Spring would do something like
display = new Display();
display.setDiagonal("sss");
Which, I guess, is what you want.

Answer 5

I don't know if this is your problem too, but with me the value is wrong and caused a error 405, example:
#RequestMapping(value = "/planilha/{id}", method = RequestMethod.PUT)
public String update(#PathVariable("id") String id, #RequestBody String jsonStr) {
BasicDBObject json = ((BasicDBObject) JSON.parse(jsonStr));
PlanilhaDAO dao = new PlanilhaDAO();
BasicDBObject ola = dao.update(id, json);
return ola.toString();
}
#RequestMapping(value = "/planilha/{id}", method = RequestMethod.DELETE)
public String delete(#PathVariable("id") String id) {
PlanilhaDAO dao = new PlanilhaDAO();
BasicDBObject temp = dao.remove(id);
return temp.toString();
}
Needed the change for:
#RequestMapping(value = "/planilha/{id}/**", method = RequestMethod.PUT)
public String update(#PathVariable("id") String id, #RequestBody String jsonStr) {
BasicDBObject json = ((BasicDBObject) JSON.parse(jsonStr));
PlanilhaDAO dao = new PlanilhaDAO();
BasicDBObject ola = dao.update(id, json);
return ola.toString();
}
#RequestMapping(value = "/planilha/{id}", method = RequestMethod.DELETE)
public String delete(#PathVariable("id") String id) {
PlanilhaDAO dao = new PlanilhaDAO();
BasicDBObject temp = dao.remove(id);
return temp.toString();
}