JSON getting encoded after returning from controller - json

Question

A Spring controller has the following method :
#RequestMapping(value = "reportsOverall.html")
public/* #ResponseBody */
ModelAndView reportsOverall(SearchParameters searchParameters) {
searchParameters = new SearchParameters(840, "SCH_01", "PRM_07");
System.out.println("Inside controller");
String result = overallDetailsService
.getOverallDetails(searchParameters);
System.out.println("result is " + result);
Map<String, String> model = new HashMap<String, String>();
model.put("data", result);
ModelAndView modelAndView = new ModelAndView("reports/reportsOverall",
model);
return modelAndView;
}
I get the expected output on the server-side console :
result is { "_id" : { "SpId" : 840 , "Scheduler_id" : "SCH_01"} , "positive_count" : 64 , "neutral_count" : 78 , "negative_count" : 2}
But in the reportsOverall.jsp, when I retrieve the result object as :
function drawSentimentPieChart() {
var data = '<c:out value="${data}"/>';
alert(data);
var dataJson = JSON.parse(data);
......
}
in the alert I get :
{ "_id" : { "SpId" : 840 , "Scheduler_id" : "SCH_01"} , "positive_count" : 64 , "neutral_count" : 78 , "negative_count" : 2}
The space and "" quotes are encoded here, thereby, causing the parse to fail.
The spring-servlet.xml is :
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.lnt" />
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"></bean>
<!-- <bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<array>
<bean
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes" value="text/plain;charset=UTF-8" />
</bean>
</array>
</property>
</bean> -->
<bean id="jacksonMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basenames"
value="classpath:userProfile,classpath:default,classpath:messages,classpath:customerAdmin,classpath:reports,classpath:superAdmin" />
<property name="defaultEncoding" value="UTF-8" />
</bean>
<bean id="dateFormat" class="java.text.SimpleDateFormat">
<constructor-arg value="yyyy-MM-dd hh:mm:ss" />
</bean>
</beans>
I tried several things in the Spring controller :
Using #ResponseBody; in this case, I got a dump on the page like this but the page wasn't rendered properly :
{"view":null,"model":{"data":"{ \"_id\" : { \"SpId\" : 840 , \"Scheduler_id\" : \"SCH_01\"} , \"positive_count\" : 64 , \"neutral_count\" : 78 , \"negative_count\" : 2}"},"empty":false,"viewName":"reports/reportsOverall","reference":true,"modelMap":{"data":"{ \"_id\" : { \"SpId\" : 840 , \"Scheduler_id\" : \"SCH_01\"} , \"positive_count\" : 64 , \"neutral_count\" : 78 , \"negative_count\" : 2}"}}
Added encoding filter to the web.xml :
<filter>
<filter-name>encoding-filter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding-filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Attempted using MappingJacksonJsonView in vain !
What is that I'm overlooking?

Answer 1

I had the same problem, but this additional attribute saved me:
<c:out value="${data}" escapeXml="false"/>