public class Bean {

    private final String id;

    public Bean(String id) {
        this.id = id;
    }

    public String getId() {
        return id;
    }

}

import java.util.Locale;
import org.json.JSONObject;

public class JSONIssue {

    public static void main(String[] args) {
        Locale.setDefault(new Locale("en"));
        JSONObject jsonen = new JSONObject(new Bean("beanId"));
        System.out.println("jsonen " + jsonen);

        Locale.setDefault(new Locale("tr"));
        JSONObject jsontr = new JSONObject(new Bean("beanId"));
        System.out.println("jsontr " + jsontr);
    }

}