How to Convert CSV to JSON in Java low garbage

CsvToJsonNoString.java

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import org.simpleflatmapper.csv.CsvParser;
import org.simpleflatmapper.csv.CsvReader;
import org.simpleflatmapper.csv.parser.CellConsumer;
import org.simpleflatmapper.util.ErrorHelper;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class CsvToJsonNoString {

    public static void main(String[] args) throws IOException {
        CsvReader reader = CsvParser.reader("col1,col2\nval1,val2");

        JsonFactory jsonFactory = new JsonFactory();


        List<String> headers = new ArrayList<>();
        if (reader.parseRow(CellConsumer.of(headers::add))) {

            try (JsonGenerator jsonGenerator = jsonFactory.createGenerator(System.out)) {

                jsonGenerator.writeStartArray();
                
                reader.parseAll(new CellConsumer() {
                    
                    int index = 0;
                    @Override
                    public void newCell(char[] chars, int offset, int length) {
                        try {
                            if (index == 0) {
                                jsonGenerator.writeStartObject();
                            }

                            if (index < headers.size()) {
                                jsonGenerator.writeFieldName(headers.get(index));
                                jsonGenerator.writeString(chars, offset, length);
                            }
                            
                            index++;
                            
                        } catch (IOException e) {
                            ErrorHelper.rethrow(e);
                        }
                    }

                    @Override
                    public boolean endOfRow() {
                        try {
                            if (index != 0) {
                                jsonGenerator.writeEndObject();
                            }
                        } catch (IOException e) {
                            ErrorHelper.rethrow(e);
                        }
                        index = 0;
                        return true;
                    }

                    @Override
                    public void end() {
                        endOfRow();
                    }
                });

                jsonGenerator.writeEndArray();
            }
        }
    }
}