How to solve conflicting getter definitions for property in jackson without access to source

I'm getting this error:

HTTP Status 500 - Could not write JSON: Conflicting getter definitions for property "oid"

The problem is that the class has two similar methods:

getOID (deprecated) and getOid

But I cannot modify the class as it's just a dependency.

Is there a way to fix this issue?

If you can not modify POJO you can implement custom serialiser or use MixIn feature.

Assume, your class looks like below:

class Id {
	private int oid;

	@Deprecated
	public int getOID() {
		return oid;
	}

	public int getOid() {
		return oid;
	}

	public void setOid(int oid) {
		this.oid = oid;
	}

	@Override
	public String toString() {
		return "oid=" + oid;
	}
}

You need to create an interface with extra configuration:

interface IdIgnoreConflictMixIn {
	@JsonIgnore
	int getOID();

	@JsonProperty
	int getOid();
}

Now, you need to register this interface:

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

public class JsonMixInApp {
	public static void main(String[] args) throws IOException {
		Id id = new Id();
		id.setOid(1);

		ObjectMapper mapper = new ObjectMapper();
		mapper.addMixIn(Id.class, IdIgnoreConflictMixIn.class);

		mapper.writeValue(System.out, id);
	}
}

Above code prints:

{"oid":1}

See also:

• Custom Jackson Serializer for a specific type in a particular class
• What is equivalent code settings for @JSonIgnore annotation?
• Jackson parse json with unwraping root, but without ability to set @JsonRootName
• Make Jackson serializer override specific ignored fields