paintComponent() output error

Question

i'm trying to make a program that will connect two points that i click in my JPanel. i'm trying to connect the two points with a line. i displayed the values of my (x1, y1) and (x2,y2) coordinates whenever i click using the mouse and there is no error in the values. but when the line is displayed, it the line doesn't seem to follow the coordinates i specify but instead outputs in a different location and is distorted. most of the lines will appear to be cut by something, i think it's the rectangle created by the line because i used setBounds(). also, i add a System.out.println("") inside my paintComponent function and i noticed that it printed multiple times (increasing by 1 after every click) even though it should only print once. can anyone help me with this? thanks!

here are two of the classes which contribute to the error:

CLASS # 1:

import java.awt.event.MouseEvent;
import javax.swing.JPanel;


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Arch. Don Saborrido
 */
public class twixtBoard extends JPanel implements java.awt.event.MouseListener{
    int x1 = 0, x2, y1 = 0, y2;
    DrawLine line;
    //DrawLine line;


    public twixtBoard(){
       //requestFocus();
        setLayout(null);
        setVisible(false);
        setBounds(0,0,600,450);
        setOpaque(false);
        setFocusable(false);
        addListener();
    }

    public void addListener(){
        addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e) {
        if (x1 == 0 || y1 == 0){
                    x1 = e.getX();
                    y1 = e.getY();
                    System.out.println(x1 + " " + y1);
        }
        else{
            x2 = e.getX();
            y2 = e.getY();
            //System.out.println(x2 + " " + y2);
            line = new DrawLine(x1, y1, x2, y2);
            line.setBounds(x1, y1, x2, y2);
            System.out.println("" + line.getLocation());
            //line.setOpaque(false);
            add(line);
            x1 = x2;
            y1 = y2;
            repaint();
        }
    }

    public void mousePressed(MouseEvent e) {
        //throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseReleased(MouseEvent e) {
        ///throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseEntered(MouseEvent e) {
        //throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseExited(MouseEvent e) {
        //throw new UnsupportedOperationException("Not supported yet.");
    }
}

CLASS # 2 (Paint Class):

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Arch. Don Saborrido
 */
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
//import java.awt.geom.Line2D;
import javax.swing.JPanel;

public class DrawLine extends JPanel{
    int x1 = 0, x2 = 0, y1 = 0, y2 = 0;
    //Line2D line;
    Stroke[] s = new Stroke[] {new BasicStroke(10.0f, BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND)};
    //new BasicStroke(25.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL),
    //new BasicStroke(25.0f, BasicStroke.CAP_SQUARE,BasicStroke.JOIN_MITER)
    GeneralPath path = new GeneralPath();

    public DrawLine(int start_x, int start_y, int end_x, int end_y){
        x1 = start_x;
        y1 = start_y;
        x2 = end_x;
        y2 = end_y;
        System.out.println(x1+ " " + y1+ " " + x2+ " " + y2+ " ");
    }

    @Override
    protected void paintComponent(Graphics g) {
        System.out.println("entered paint");
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.BLACK);
        g2.setStroke(s[0]);
        path.moveTo(x1,y1);
        System.out.println("x1 = " + x1 + " y1 = " + y1);
        path.lineTo(x2,y2);
        System.out.println("x2 = " + x2 + " y2 = " + y2);
        System.out.println("" + path.getBounds2D());
        g2.draw(path);
        //line = new Line2D.Float(x1, y1, x2, y2);
        //if(x1 != x2 && y1 != y2)
            //g2.draw(line);
    }
}