Java 如何向组件侧RSyntaxTextArea显示行数

如何显示组件旁边的行数->RSyntaxTextArea

下面的代码可以工作，但是我需要使用特定的组件来代替我的框架，当我这样做时，旁边的行就会消失

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package br.com.flp.entidades;

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.SyntaxConstants;
import org.fife.ui.rtextarea.RTextScrollPane;

/**
 *
 * @author Filipe
 */
public class TextEditorRSyntax extends JFrame {

    public TextEditorRSyntax() {

        JPanel cp = new JPanel(new BorderLayout());

        RSyntaxTextArea textArea = new RSyntaxTextArea(20, 60);
        textArea.setSyntaxEditingStyle(SyntaxConstants.SYNTAX_STYLE_SQL);
        textArea.setCodeFoldingEnabled(true);
        RTextScrollPane sp = new RTextScrollPane(textArea);
        cp.add(sp);

         Color azulClaro =  Color.decode("#E0EEEE");
        textArea.setCurrentLineHighlightColor(azulClaro);
        setContentPane(cp);
        setTitle("Text Editor Demo");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);

    }

    public static void main(String[] args) {
        // Start all Swing applications on the EDT.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TextEditorRSyntax().setVisible(true);
            }
        });
    }

}

放松点，孩子，他是你的朋友

sp.setLineNumbersEnabled(true);