HttpMessageConverter not found in Spring restTemplate - spring

Question

I have got error when I retrieve JSON using String restTempate. Error says
Could not extract response: no suitable HttpMessageConverter found for response type [class au.org.jeenee.mdm.models.PhoneResponse] and content type [application/json]
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:107)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:492)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:447)
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:295)
at au.org.jeenee.mdm.services.EccClientServiceImpl.findPhoneByImei(EccClientServiceImpl.java:51)
at au.org.jeenee.mdm.controllers.DeviceController.showEditForm(DeviceController.java:308)
I found out the message means there is no JSON converter registered but I have Jackson message converter in my xml.
applicationContext.xml
<bean id="jacksonMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jacksonMessageConverter" />
</list>
</property>
</bean>
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
<constructor-arg ref="httpClient"/>
</bean>
</constructor-arg>
<property name="messageConverters">
<list>
<ref bean="jacksonMessageConverter" />
</list>
</property>
</bean>
And here is my code to use RestTemplate.
public class MyRestClientService {
#Override
public List<DeviceHolder> findDeviceHoldersByUserId(String userId) {
String uri = "/web/getpersonlist?userId=" + userId;
try {
DeviceHolderResponse response = restClient.getRestTemplate().postForObject(restClient.createUrl(uri), "", DeviceHolderResponse.class);
if (response!=null && response.isOk() && response.getResult()!=null){
DeviceHolder[] deviceHolders = response.getResult();
return Arrays.asList(deviceHolders);
}
} catch (Exception e) {
e.printStackTrace();
}
return Collections.emptyList();
}
#Override
public Phone findPhoneByImei(String imei) {
log.info("findPhoneByImei:" + imei);
Phone phone = null;
String uri = "/ecc/getphoneplan?imei=" + imei;
try {
PhoneResponse response = restClient.getRestTemplate().postForObject(restClient.createUrl(uri), "", PhoneResponse.class);
if (response.getResult()!=null)
phone = response.getResult();
} catch (Exception e) {
e.printStackTrace();
}
return phone;
}
}
PhoneResponse.java
public class Phone implement Serializable {
private boolean ok;
private String message;
private Phone result;
//getters and setters
}
Phone.java
public class Phone implements Serializable {
#JsonProperty(value="phoneid")
private long phoneId;
private Plan plan;
private String sim;
private String imei;
#JsonProperty(value="phonetype")
private String phoneType;
#JsonProperty(value="phonenumber")
private String phoneNumber;
private String label;
#JsonProperty(value="connecteddate")
private String connectedDate;
//getters and setters
}
Plan.java
public class Plan implements Serializable {
#JsonProperty(value="planid")
private long planId;
#JsonProperty(value="planname")
private String planName;
private double billingIncrement;
private double owiStdUnitCost;
private double owiFlagFall;
private double stdCap;
private double dataCap;
private double smsCap;
private double owiDataUnitCost;
private double owiSms;
//getters and setters
}
And the response packet is like following:
{
"ok": true,
"message": "",
"result":
{
"phoneid": 600003,
"phonenumber": 478439503,
"phonetype": "Samsung Galaxy S2",
"imei": "1111111111",
"sim": "1111111111",
"label": "Person name",
"connecteddate": "2012-09-19 00:00:00.0",
"plan":
{
"planid": 34,
"planname": "$59 Plan",
"billingIncrement": 30,
"owiStdUnitCost": 81.8181818181818,
"owiFlagFall": 0,
"stdCap": 636.3636,
"dataCap": 227.2665,
"smsCap": 1363.638,
"owiDataUnitCost": 0.022194,
"owiSms": 22.7272727272727
}
}
}
Strangely, there is no error when I call findDeviceHoldersByUserId method but error for findPhoneByImei method. And this has been working up to just before.
I tried again and again but I still have the error. Please help to fix the problem.
Thanks.

Answer 1

Couple of reasons, I found, that can cause this issue are -
Data type of the setters/getters are different from that of the actual properties (also mentioned in comment of sunghun)
If there are overloaded methods that may look like setter/getter of a field - same name as setField or getField where field is a property of the class.
I had a field private boolean success and 2 setter methods -
public void setSuccess(List<Object> dataList);
public void setSuccess(boolean success);
On debugging, I found that class com.fasterxml.jackson.databind.deser.BeanDeserializerFactory was throwing an exception. This exception was suppressed within Jackson's lib and the exception thrown by the RestTemplate was the same as the subject.
java.lang.IllegalArgumentException: Conflicting setter definitions for property "failure": com.test.dto.JsonResponse#setFailure(1 params) vs com.test.dto.JsonResponse#setFailure(1 params)
I changed the method to public void setSuccessData(List<Object> dataList); and it worked fine.
Hope this helps someone.