Mapping JSONArray in RestTemplate Spring

Question

I am trying to map this JSONArray using Spring RestTemplate:

[{
    "Command": "/usr/sbin/sshd -D",
    "Created": 1454501297,
    "Id": "e00ca61f134090da461a3f39d47fc0cbeda77fbbc0610439d3c16a932686b612",
    "Image": "ubuntu:latest",
    "Labels": {

    },
    "Names": [
        "/nova-c1896fbd-1309-4da2-8d77-b4fe4c02fa8e"
    ],
    "Ports": [

    ],
    "Status": "Up 2 hours"
}, {
    "Command": "/usr/sbin/sshd -D",
    "Created": 1450106126,
    "Id": "7ffc9dbdd200e2c23adec442abd656ed57306955332697cb7da979f36ebf3b22",
    "Image": "ubuntu:latest",
    "Labels": {

    },
    "Names": [
        "/nova-93b9ae40-8135-48b7-ac17-12094603b28c"
    ],
    "Ports": [

    ],
    "Status": "Up 2 hours"
}]

Here is ContainersInfo class:

@JsonIgnoreProperties(ignoreUnknown = true)
public class ContainersInfo {


    private String Id;


    private List<String> Names;

    public String getId() {
        return Id;
    }

    public void setId(String id) {
        Id = id;
    }

    public List<String> getNames() {
        return Names;
    }

    public void setNames(List<String> names) {
        Names = names;
    }
}

However I get null when I want to get the data:

ContainersInfo[] containers = syncRestTemplate.getForObject("http://192.168.1.2:4243/containers/json?all=1", ContainersInfo[].class);

for (int i = 0; i < containers.length; i++)
            System.out.println("id:" + containers[i].getId());

The resulting output is as follows:

id:null

id:null

Any idea, what I should do?

Are you sure your Labels part is object? Or it should be array? — Pradip Borde
– Pradip Borde, Commented Feb 9, 2016 at 13:10
I even don't try to map Labels I just try to get Id and Names in ContainersInfo class — secret
– secret, Commented Feb 9, 2016 at 13:11
@PradipBorde I can't do that, that's the JSON I receive from a server. — secret
– secret, Commented Feb 9, 2016 at 13:14

Michal Foksa · Accepted Answer · 2016-02-10 15:02:47Z

1

Your JSON field names are in pascal case as opposed to camel case (which is usually the case). Set Jackson naming strategy to PascalCaseStrategy, i.e by adding @JsonNaming(PascalCaseStrategy.class) annotation into ContainersInfo class.

edited Feb 10, 2016 at 15:02

answered Feb 10, 2016 at 11:12

Michal Foksa

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1 Comment

secret Over a year ago

yeah I know chrome extension to show JSON data in formatted way, changes that. That's not the issue.

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