Unable to convert JSON Array into a List in Java

I have an issue in converting JSONArray into a List using Jackson Object Mapper.

public class Main {

public static void main(String[] args) throws Exception {
	String test = Files.readString(Path.of("test.json"));
	callRequired(test);
}

public static void callRequired(String test) {
	ObjectMapper mapper = new ObjectMapper();
	try {
		List<Condition> result = mapper.readerForListOf(Condition.class).readValue(test.trim());
		System.out.println(result);
	} catch (JsonMappingException e) {
		e.printStackTrace();
	} catch (JsonProcessingException e) {
		e.printStackTrace();
	}
}

}

The test.json is:

{
	"condition": [
		{
			"type": "NONE",
			"subConditons": [
				{
					"type": "NONE",
					"subConditions": []
				},
				{
					"type": "AND",
					"subConditions": [
						{
							"type": "NONE",
							"subConditions": []
						}
					]
				}
			]
		},
		{
			"type": "OR",
			"subConditions": []
		}
	]
}

The Condition class is as follows:

public class Condition {
Type type = Type.NONE;
List<Condition> subConditions;

public Condition() {
	
}

public Condition(Type type, List<Condition> subConditions) {
	this.type = type;
	this.subConditions = subConditions;
}

public List<Condition> getSubConditions() {
    return subConditions;
}

public void setSubConditions(List<Condition> subConditions) {
    this.subConditions = subConditions;
}

public Type getType() {
    return type;
}

public void setType(Type type) {
    this.type = type;
}

public enum Type {
    NONE,
    AND,
    OR;
}

@Override
public String toString() {
	return "Condition [type=" + type + ", subConditions=" + subConditions + "]";
    }
}

Edit: The Condition array contains a list of conditions within which lies a subCondition which is also a type of Condition.

EDIT: Thanks, I have added the requisite braces and checked for its validity. I have also added an all args construcutor and a no args constructor as well.

How do I change the JSON so that I receive a List of conditions with the proper subconditions nested with Jackson.

In your JSON, the "condition" object starts with a "[", setting its type to an array. This isn't how your condition object class look like.

It should be more like:

[
    {
        "type" : "NONE",
        "subConditions" : []
    }
]

If you have no objection to switching to Gson, here is a basic parse.

String test = Files.readString(Path.of("test.json"));
Gson gson = new Gson();
JsonElement element = gson.fromJson(test, JsonObject.class).get("condition");
List<Condition> conditions = Arrays.asList(gson.fromJson(element, Condition[].class));

class Condition {
    Type type;
    List<Condition> subConditions;

    @Override
    public String toString() {
        return "(%s, %s)".formatted(type, subConditions);
    }
}

enum Type {
    NONE, AND, OR
}

Output

(NONE, [(NONE, []), (AND, [(NONE, [])])])
(OR, [])