ajax request.java

<bean
            class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="mediaTypes">
            <map>
                <entry key="json" value="application/json"/>
                <entry key="xml" value="text/xml"/>
                <entry key="htm" value="text/html"/>
            </map>
        </property>
        <property name="favorParameter" value="true"/>
        <property name="favorPathExtension" value="false"/>
        <property name="ignoreAcceptHeader" value="true"/>
        <property name="defaultContentType" value="application/json"/>
    </bean


 @RequestMapping(method = RequestMethod.GET, produces = "application/json")
    @ResponseBody
    public List<Content> findAll() {
        return contentService.getAllContents();
 }

dependency : 

<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-mapper-asl</artifactId>
	<version>1.9.12</version>
</dependency>
            
<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-core-asl</artifactId>
	<version>1.9.12</version>
</dependency>