Java POJO to JSON

CsvError.java

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Getter;
import java.util.ArrayList;
import java.util.List;


@Getter
public class CsvError {
    private String filename;
    private List<Error> errors = new ArrayList<>();

    public void addError(Error error) {
        errors.add(error);
    }

    public void setFilename(String filename) {
        this.filename = filename;
    }


    @Getter
    public static class Error {
        private long lineNumber;
        private String errorMessage;
        public static String INCORRECT_NO_COLUMNS = "Incorrect number of columns.";

        public Error(long lineNumber) {
            this(lineNumber, INCORRECT_NO_COLUMNS);
        }

        public Error(long lineNumber, String errorMessage) {
            this.lineNumber = lineNumber;
            this.errorMessage = errorMessage;
        }
    }



    public static void main(String[] args) throws JsonProcessingException {
        CsvError container = new CsvError();

        container.setFilename("abc.csv");

        Error error1 = new Error(3);
        Error error2 = new Error(7);

        container.addError(error1);
        container.addError(error2);

        String serializedJson = new ObjectMapper().writeValueAsString(container);

        System.out.println(serializedJson);
    }

}

/** Output
{
    "filename":"aaaa.txt",
    "errors":[
        {
            "lineNumber":3,
            "errorMessage":"Incorrect number of columns"
        },
        {
            "lineNumber":7,
            "errorMessage":"Incorrect number of columns"
        }
    ]
}
*/