deserializing nested array of values using Jackson

Question

I have a json file that contains a nested array of values:

[
    {"target": "dsdsa", 
     "datapoints": 
        [
            [94.283, 1435080720], 
            [94.233, 1435080780], 
            ....
        ]
     }
]

I'm having problem parsing inner nested arrays. I'm using Spring and Jackson. I first parse the outer array using:

Output[] allJson = restTemplate.getForObject("json/url",Output[].class);

where Output is a POJO:

public class Output
{
    public String target;
    //public Datapoint[] datapoints;
}   

public class Datapoint 
{
    private double[] points;
}

Using this I can access the "target" from the json. But if I uncomment it, Jackson is not able to map the array of array of values to the Datapoints.

Do I need another wrapper class? I couldn't find any example where inside the array there is anything except json objects and Jackson parses it.

barunsthakur · Accepted Answer · 2015-06-25 19:51:30Z

0

[94.283, 1435080720] inside datapoints is not a json object but it's a json list. You will have to use two dimentional array or a list within a list for datapoints. Use

public double[][] datapoints; or List<List<Double>> datapoints

answered Jun 25, 2015 at 19:51

barunsthakur

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