Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token

Question

Below mentioned is the JSON string, resultString:

{
"imageMaps": [{
        "crc": "c2c4",
        "flags": "0",
        "length": "117384",
        "index": 1,
        "version": "1.1.90ea",
        "status": ""
    }, {
        "crc": "7601",
        "flags": "8",
        "length": "117592",
        "index": 2,
        "version": "1.1.90ed",
        "status": ""
    }],
    "complete": true,
    "nextBootImageVersion": "",
    "lastKnownGoodImageVersion": "1.1.90ed",
    "runningImageVersion": "1.1.90ed"
}

I want to get the same converted to the object of class A:

public class A {

    private boolean complete;

    private String message;

    private String lastKnownGoodImageVersion;

    private String nextBootImageVersion;

    private String runningImageVersion;

    private Map<String, B> imageMaps;

    private  List<B> images;

    private MacID macId;

}

I am trying to convert the json to object of class A using the code :

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);    
A a = objectMapper.readValue(resultString, A.class);

Code for class B is:

public static class B {
    public String version;
    public int flags; 
    public int crc; 
    public long length; 
    public String index;
    public String status;
}

But getting the exception :

com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token

Konrad Botor · Accepted Answer · 2018-06-25 11:19:52Z

8

You declared property imageMaps as a Map<String, B> in your class, but in your JSON imageMaps is an array of B. The deserialization should work if you change imageMaps to images in your JSON.

answered Jun 25, 2018 at 11:19

Konrad Botor

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2 Comments

Random Coder Over a year ago

I don't have a control on the json string. I can change the structure of the class though.

Konrad Botor Over a year ago

In that case try changing private Map<String, B> imageMaps; to private List<B> imageMaps;

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