Java file to show when paintComponent is being called.

Crud.java

import java.awt.*;
import javax.swing.*;

class DrawPanel extends JPanel {
  public void paintComponent(final Graphics g) {
		System.out.println("paintComponent called now!");	
	}
}

public class Crud {

	public static void main(String[] args) {
		JFrame f = new JFrame("testing");
		f.setSize(300,300);
		f.add(new DrawPanel());
		f.setVisible(true);

	}
}