RestTemplate POST a Collection - rest

Question

Ok here iam back to find a solution.
Iam trying Spring RestTemplate postForEntity method to send a Collection of instances. When attempting spring gives an error org.springframework.http.converter.HttpMessageNotWritableException: Could not write request: no suitable HttpMessageConverter found for request type [com.abc.base.domai
n.dto.gift.GiftItemList Appriciate, if someone can tells me how to send a an ArrayList with spring resttemplate POST method.
RestTemplate bean:
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<constructor-arg ref="httpClientFactory"/>
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean id="jsonViewResolver" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" >
<property name="objectMapper">
<ref bean="JacksonObjectMapper" />
</property>
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg value="application" />
<constructor-arg value="json" />
<constructor-arg value="#{T(java.nio.charset.Charset).forName('UTF-8')}"/>
</bean>
</list>
</property>
</bean>
</list>
</property>
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />
<bean id="httpClient" class="org.apache.commons.httpclient.HttpClient">
<constructor-arg ref="httpClientParams"/>
</bean>
<bean id="httpClientParams" class="org.apache.commons.httpclient.params.HttpClientParams">
<property name="connectionManagerClass" value="org.apache.commons.httpclient.MultiThreadedHttpConnectionManager"/>
</bean>
<bean id="httpClientFactory" class="org.springframework.http.client.CommonsClientHttpRequestFactory">
<constructor-arg ref="httpClient"/>
</bean>
Instance that iam trying to POST,
public class GiftItem implements Entity, Serializable {
private static final long serialVersionUID = 1L;
private String redeemLocation;
private String itemName;
private String itemDescription;
private String merchantName;
private Integer quantity;
private Integer imageId;
public GiftItem() {
super();
}
//with getters and setters
}
GiftItem instance wraaper class
public class GiftItemList implements Serializable {
private static final long serialVersionUID = -8202204714984099030L;
public GiftItemList() {
}
private List<GiftItem> giftItemList;
public List<GiftItem> getGiftItemList() {
return giftItemList;
}
public void setGiftItemList(List<GiftItem> giftItemList) {
this.giftItemList = giftItemList;
}
}
this is how i use it,
public BaseResponse sendGiftEmail(final String token, final User sender,final String message, final GiftItemList giftItemList) {
MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
map.add("token", token);
map.add("sender", sender);
map.add("message", message);
map.add("giftItemList", giftItemList);
return getRestTemplate().postForEntity(
"http://localhost:8080/notification/api/notification/send_gift_email",
map, BaseResponse.class).getBody();
}
and the error i am getting,
org.springframework.http.converter.HttpMessageNotWritableException: Could not write request: no suitable HttpMessageConverter found for request type [com.abc.base.domain.dto.gift.GiftItemList]
at org.springframework.http.converter.FormHttpMessageConverter.write Part(FormHttpMessageConverter.java:310)
at org.springframework.http.converter.FormHttpMessageConverter.write Parts(FormHttpMessageConverter.java:270)
at org.springframework.http.converter.FormHttpMessageConverter.write Multipart(FormHttpMessageConverter.java:260)
at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:200)
at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:1)
at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:588)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:436)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:401)
at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:302)
at com.tapgift.gift.client.impl.GiftClientImpl.sendGiftNotifications(GiftClientImpl.java:101)
pom:
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.2</version>
</dependency>
almost forgot receiver controller,
#RequestMapping(value = "/notification/send_gift_email", method = RequestMethod.POST)
public #ResponseBody BaseResponse sendGiftEmail(#RequestParam("token") String token, #RequestParam("sender")final User sender, #RequestParam("message")final String message,#RequestParam("giftItemList") GiftItemList giftItemList) {
}

Answer 1

You have to add MappingJacksonHttpMessageConveter to your messageCoverter :
List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
messageConverters.add(new FormHttpMessageConverter());
messageConverters.add(new StringHttpMessageConverter());
messageConverters.add(new MappingJacksonHttpMessageConverter());
restTemplate = new RestTemplate();
restTemplate.setMessageConverters(messageConverters);
You also need to add the dependency for :
jackson-core-asl-x.x.x.jar & jaackson.mapper.asl-x.x.x.jar
Another thing, you have to make sure that your class have the same attribute as your JSON properties. For example :
{"data":{"ticket":"TICKET_870299cf98e227abdbd5f9b7064390c5723a0c6a"}}
To fill your class properties, they have to be like this :
person.java
public class person {
private Data data;
public Data getData() {
return data;
}
public void setData(Data data) {
this.data = data;
}
}
data.java
public class Data {
private String ticket;
public String getTicket() {
return ticket;
}
public void setTicket(String ticket) {
this.ticket = ticket;
}
}
Finaly in your application your add :
person entity = restTemplate.postForObject(url, requestEntity,
person.class);
requestEntity is a String that contains your request body (JSON in my case).
Hope that helped !