I'm trying to parse my json request to my model. I dunno what is wrong in this code. Syntax of json looks correct and annotations on Java model also. I don't know why I'm getting error like:
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of ParametersType out of START_ARRAY token
(through reference chain: Document["parameters"])
Java model:
@JsonIgnoreProperties( ignoreUnknown = true )
public class Document {
@XmlElement( required = true )
@JsonProperty( "templateId" )
protected String templateId;
@JsonProperty( "parameters" )
@XmlElement( required = true )
protected ParametersType parameters;
@JsonProperty( "documentFormat" )
@XmlElement( required = true )
protected DocumentFormatType documentFormat;
...}
@JsonIgnoreProperties( ignoreUnknown = true )
public class ParametersType {
@JsonProperty( "parameter" )
protected List<ParameterType> parameter;
...}
@JsonIgnoreProperties( ignoreUnknown = true )
public class ParameterType {
@XmlElement( required = true )
@JsonProperty( "key" )
protected String key;
@XmlElement( required = true )
@JsonProperty( "value" )
@XmlSchemaType( name = "anySimpleType" )
protected Object value;
@JsonProperty( "type" )
@XmlElement( required = true, defaultValue = "STRING_TYPE" )
protected ParamType type;
....}
Json code:
{
"templateId": "123",
"parameters": [
{
"parameter": [
{
"key": "id",
"value": "1",
"type": "STRING_TYPE"
},
{
"key": "id2",
"value": "12",
"type": "STRING_TYPE"
}
]
}
],
"documentFormat": "PDF"
}
You have declared parameters as a single object, but you are returning it as an array of multiple objects in your JSON document.
Your model currently defines the parameters node as a ParametersType object:
@JsonProperty( "parameters" )
@XmlElement( required = true )
protected ParametersType parameters;
This means your model object is expecting a JSON document that looks like the following:
{
"templateId": "123",
"parameters": {
"parameter": [
{
"key": "id",
"value": "1",
"type": "STRING_TYPE"
},
{
"key": "id2",
"value": "12",
"type": "STRING_TYPE"
}
]
},
"documentFormat": "PDF"
}
But in your JSON document you are returning an array of ParametersType objects. So you need to change your model to be a list of ParametersType objects:
@JsonProperty( "parameters" )
@XmlElement( required = true )
protected List<ParametersType> parameters;
The fact that you are returning an array of ParametersType objects is why the parser is complaining about not being able to deserialize an object out of START_ARRAY. It was looking for a node with a single object, but found an array of objects in your JSON.
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