I have the following json that is mapped to a POJO using Jackson mapper. How do I retain the order of array columns from json during deserialization ? What annotation should I use ?
JSON:
{
"columnNames": [
"FirstName",
"LastName",
"UserName"
],
"values": [
[
"John",
"Smith",
"jsmith"
],
[
"Tim",
"Cook",
"tcook"
]
]
}
POJO:
public class Data implements Serializable {
private List<String> columnNames = new ArrayList<String>();
private List<ArrayList<String>> values = new ArrayList<ArrayList<String>>();
public List<String> getColumnNames() {
return columnNames;
}
public void setColumnNames(List<String> columnNames) {
this.columnNames = columnNames;
}
public List<ArrayList<String>> getValues() {
return values;
}
public void setValues(List<ArrayList<String>> values) {
this.values = values;
}
}
- Expected getColumnNames(): {“FirstName”,”LastName”,”UserName”}
- Actual getColumnNames(): {“UserName”,”FirstName”,”LastName”}
I am new to Jackson mapping so any help is appreciated.
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Answer
Jackson mapper fill the ArrayList maintaining the order of JSON. If you want a different order you can use the annotation @JsonPropertyOrder.