com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize out of START_ARRAY token

Question

I'm getting START_ARRAY error for following model. I'm expecting object of InputDetails

class InputDetails{ public List<EachFieldDetails> fieldDetails; } class EachFieldDetails{ public String fieldName; public String value; }

JSON input is as follows:

[{"fieldName":"siteName","value":"Warehouse"},{"fieldName":"poNumber","value":"po1"},{"fieldName":"itemCode","value":"itemcode1"},{"fieldName":"asdnSerialNo","value":"null"}]

Can someone provide me the solution.

Here is my class

public Response setWHDetails(@BeanParam RequestBean requestBean,InputDetails saveInputs) { //Do operation }

Could u plz share ur code?

Bacteria
– Bacteria

2015-07-08 13:30:40 +00:00
Commented Jul 8, 2015 at 13:30 — Bacteria
– Bacteria, Commented Jul 8, 2015 at 13:30
show us the code that does the parsing please

Sharon Ben Asher
– Sharon Ben Asher

2015-07-08 13:30:50 +00:00
Commented Jul 8, 2015 at 13:30 — Sharon Ben Asher
– Sharon Ben Asher, Commented Jul 8, 2015 at 13:30

Baldy · Accepted Answer · 2015-07-08 13:48:23Z

Your JSON specifies an array while you're trying to deserialize into an object.

if your JSON was like:

{ "fieldDetails" : [ {"fieldName":"siteName","value":"Warehouse"}, {"fieldName":"poNumber","value":"po1"}, {"fieldName":"itemCode","value":"itemcode1"}, {"fieldName":"asdnSerialNo","value":"null"} ] }

It would probably work. Alternately, you could deserialize directly into an array.

I say probably because you haven't provided any code or information of what tool or library you're using to handle the deserialization process.

Arpit Aggarwal · Accepted Answer · 2015-07-08 14:14:47Z

You might need this:

import java.io.File; import java.io.IOException; import java.util.List; import org.codehaus.jackson.map.ObjectMapper; import org.codehaus.jackson.type.TypeReference; public class JacksonRead { public static void main(String[] args) { ObjectMapper mapper = new ObjectMapper(); try { TypeReference<List<EachFieldDetails>> typeRef = new TypeReference<List<EachFieldDetails>>() { }; List<EachFieldDetails> user = mapper.readValue(new File( "d:\\user.json"), typeRef); System.out.println(user); } catch (IOException e) { e.printStackTrace(); } } }

user.json

[{"fieldName":"siteName","value":"Warehouse"},{"fieldName":"poNumber","value":"po1"},{"fieldName":"itemCode","value":"itemcode1"},{"fieldName":"asdnSerialNo","value":"null"}]

EachFieldDetails.java

import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.annotation.JsonProperty; import com.fasterxml.jackson.annotation.JsonPropertyOrder; @JsonInclude(JsonInclude.Include.NON_NULL) @JsonPropertyOrder({ "fieldName", "value" }) public class EachFieldDetails { @JsonProperty("fieldName") private String fieldName; @JsonProperty("value") private String value; /** * * @return The fieldName */ public String getFieldName() { return fieldName; } /** * * @param fieldName * The fieldName */ public void setFieldName(String fieldName) { this.fieldName = fieldName; } /** * * @return The value */ public String getValue() { return value; } /** * * @param value * The value */ public void setValue(String value) { this.value = value; } @Override public String toString() { return "EachFieldDetail [fieldName=" + fieldName + ", value=" + value + "]"; } }

tom · Accepted Answer · 2015-07-08 13:58:25Z

I have not found any error by using your model and below code:

 String str="[{\"fieldName\":\"siteName\",\"value\":\"Warehouse\"},{\"fieldName\":\"poNumber\",\"value\":\"po1\"},{\"fieldName\":\"itemCode\",\"value\":\"itemcode1\"},{\"fieldName\":\"asdnSerialNo\",\"value\":\"null\"}]"; ObjectMapper map=new ObjectMapper(); JsonNode node=map.readTree(str);

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