Can someone please tell me Why am I getting org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type error?
Here is my call:
try
{
String jsonreturn = restTemplate.getForObject("http://" + mRESTServer.getHost() + ":8080/springmvc-rest-secured-test/json/{name}", String.class, vars);
LOGGER.debug("return object: " + jsonreturn.toString());
} catch (HttpClientErrorException e)
{
/**
*
* If we get a HTTP Exception display the error message
*/
LOGGER.error("error: " + e.getResponseBodyAsString());
ObjectMapper mapper = new ObjectMapper();
ErrorHolder eh = mapper.readValue(e.getResponseBodyAsString(), ErrorHolder.class);
LOGGER.error("error: " + eh.errorMessage);
}
which I am trying to test the error so I should be creating a ErrorHolder Object but I am getting the error;
Here is my ErrorHolder class:
public class ErrorHolder
{
public String errorMessage;
public ErrorHolder(String errorMessage)
{
this.errorMessage = errorMessage;
}
public String getErrorMessage()
{
return errorMessage;
}
public void setErrorMessage(String errorMessage)
{
this.errorMessage = errorMessage;
}
@Override
public String toString()
{
return "ErrorHolder{" +
"errorMessage='" + errorMessage + '\'' +
'}';
}
}
I dont know why I am getting the following error:
2013-06-12 14:36:32,138 [main] ERROR Main - error: {"errorMessage":"Uh oh"}
Exception in thread "main" org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class ErrorHolder]: can not instantiate from JSON object (need to add/enable type information?)
at [Source: java.io.StringReader@628016f7; line: 1, column: 2]
Jackson uses default (no argument) constructor to create object and then sets value using setters. so you only need @NoArgsConstructor and @Setter.
public class JsonMappingException extends JsonProcessingException. Checked exception used to signal fatal problems with mapping of content, distinct from low-level I/O problems (signaled using simple IOException s) or data encoding/decoding problems (signaled with JsonParseException , JsonGenerationException ).
Default Constructor - a constructor that is automatically created by the Java compiler if it is not explicitly defined.
Two options, either you provide a default no-argument constructor which does the job. However, for your use-case a nicer solution IMHO is provided by @JsonCreator and @JsonProperty:
public class ErrorHolder
{
public String errorMessage;
@JsonCreator
public ErrorHolder(@JsonProperty("errorMessage") String errorMessage)
{
this.errorMessage = errorMessage;
}
// getters and setters
}
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