How to create java object from json

Question

How can I create this json content recursively using a java object and Jackson ? :

{
    "children": [
        {
            "children": [
                {
                    "name": "cluster",
                    "children": [
                        {
                            "name": "AgglomerativeCluster",
                            "size": 3938
                        },
                        {
                            "name": "TestCLuster",
                            "size": 3938
                        }
                    ]
                }
            ],
            "name": "analytics"
        }
    ],
    "name": "flare"
}

Here is my object structure so far, a parent named DendogramVO and a child class named Children which also has a children List :

import java.util.List;

public class DendogramVO {
    private List<Children> children;
    private String name;

    public List<Children> getChildren() {
        return this.children;
    }

    public void setChildren(List<Children> children) {
        this.children = children;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

import java.util.List;

public class Children {

    private List<Children> children;
    private String name;

    public List<Children> getChildren() {
        return children;
    }

    public void setChildren(List<Children> children) {
        this.children = children;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

Answer 1

Note that your JSON contains unknown properties. You need to configure the ObjectMapper not to fail when it comes across them (or add them to your class)

String s="{ \"children\": [ { \"children\": [ { \"name\": \"cluster\", \"children\": [ { \"name\": \"AgglomerativeCluster\", \"size\": 3938 }, { \"name\": \"TestCLuster\", \"size\": 3938 } ] } ], \"name\": \"analytics\" } ], \"name\": \"flare\"}";
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
Children children = mapper.readValue(s, Children.class);

System.out.println(children.getChildren());

with a simple Children#toString() prints

[[children = [[children = [[children = null, name = AgglomerativeCluster], [children = null, name = TestCLuster]], name = cluster]], name = analytics]]