Cannot convert value of type [org.springframework.web.client.RestTemplate] to required type [org.springframework.web.client.RestTemplate]

I am trying to use RestTemplate and getting below error only when I am trying to initialize the RestTemplate bean.

Cannot convert value of type [org.springframework.web.client.RestTemplate] to required type [org.springframework.web.client.RestTemplate] for property 'restTemplate': no matching editors or conversion strategy found

This is my bean configuration : Here i am initializing the restTemplate to use it in MyService.java class

<bean id="myService" class="com.test.MyService">
<property name="serviceUrl" value="http://ift.tt/1OVNsTI"/>
<property name="restTemplate" ref="restTemplate"/>
</bean>

 <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> 
  </bean> 

This is my java code

package com.test;
import org.springframework.web.client.RestTemplate;

public class MyService {

    private String serviceUrl;
    private RestTemplate restTemplate;

    public String invoke(){
        //restTemplate = new RestTemplate(); -- This works, if bean   //initialization removed from spring xml file
        String result = restTemplate.getForObject(serviceUrl, String.class);
        return result;
    }

    //@Required
    public void setServiceUrl(String serviceUrl) {
        this.serviceUrl = serviceUrl;
    }

    public String getServiceUrl() {
        return this.serviceUrl;
    }

    public RestTemplate getRestTemplate() {
        return restTemplate;
    }

    public void setRestTemplate(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }
}

But same code is working if I create object of RestTemplate in java class itself and remove the

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/> 

from my spring xml file.