[java] gl4java and GLAnimJPanel

F:\java\projects\GLAnimJPanelTest>javac GLAnimJPanelTest.java

F:\java\projects\GLAnimJPanelTest>java GLAnimJPanelTest

set fps    := 20.0 -> 50 [ms/frame]
Exception in thread "main" java.lang.NullPointerException
        at GLtest.display(GLAnimJPanelTest.java:83)
        at GLtest.(GLAnimJPanelTest.java:33)
        at GLAnimJPanelTest.main(GLAnimJPanelTest.java:17)
 

// awt packages
import java.awt.event.*;
import java.awt.Component;

//GL4Java classes
import gl4java.GLContext;
import gl4java.swing.GLAnimJPanel;
import gl4java.drawable.*;

// swing packages
import javax.swing.*;

public class GLAnimJPanelTest {
	public static void main(String[] args) {
		JFrame f = new JFrame("GLAnimJPanelTest");
		GLtest p = new GLtest();

		f.getContentPane().add(p);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		p.run();
		f.pack();
		f.show();
	}
}

class GLtest extends GLAnimJPanel implements KeyListener, MouseListener {
	/*----------[]--------------------------------------------------------------------------------*/
	GLtest() {
		super(true);
		init();
		display();
	}
	/*----------[]--------------------------------------------------------------------------------*/
	public void init() {

		// I don''t want stereo view
		stereoView = false;
		
		// Enable Texture Mapping
		gl.glEnable(GL_TEXTURE_2D);

		// This Will Clear The Background Color To Black
		gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		// Enables Clearing Of The Depth Buffer
		gl.glClearDepth(1.0);
		// The Type Of Depth Test To Do
		gl.glDepthFunc(GL_LESS);
		// Enables Depth Testing
		gl.glEnable(GL_DEPTH_TEST);
		// Enables Smooth Color Shading
		gl.glShadeModel(GL_SMOOTH);
		// Select The Projection Matrix
		gl.glMatrixMode(GL_PROJECTION);
		// Reset The Projection Matrix
		gl.glLoadIdentity();
		// Calculate The Aspect Ratio Of The Window
		glu.gluPerspective(45.0f, (float)getSize().width / (float)getSize().height, 0.1f, 100.0f);
		// Select The Modelview Matrix
		gl.glMatrixMode(GL_MODELVIEW);
	}
	/*----------[]--------------------------------------------------------------------------------*/
	public void reshape(int width, int height) {
		// Reset The Current Viewport And Perspective Transformation
		gl.glViewport(0, 0, width, height);
		// Select The Projection Matrix
		gl.glMatrixMode(GL_PROJECTION);
		// Reset The Projection Matrix
		gl.glLoadIdentity();
		// Calculate The Aspect Ratio Of The Window
		glu.gluPerspective(45.0f, (float)getSize().width / (float)getSize().height, 0.1f, 100.0f);
		// Select The Modelview Matrix
		gl.glMatrixMode(GL_MODELVIEW);
	}
	/*----------[]--------------------------------------------------------------------------------*/
	public void doCleanup() {
		cvsDispose();
	}
	/*----------[]--------------------------------------------------------------------------------*/
	public void display() {

 		if (glj.gljMakeCurrent() == false) return;
 	//	glj.gljMakeCurrent();

		gl.glTranslatef(0, 0, -8);

		gl.glBegin(GL_TRIANGLES);
		 gl.glColor3f(0f,1f,1f);
		 gl.glVertex3f(0f, 2f, 0f);
		 gl.glColor3f(1f,0f,1f);
		 gl.glVertex3f(-2f, -1f, 0f);
		 gl.glColor3f(1f,1f,0f);
		 gl.glVertex3f(2f, -1f, 0f);
		gl.glEnd();

		//Swap buffers
		glj.gljSwap();
		glj.gljFree(true);
	}
	/*----------[]--------------------------------------------------------------------------------*/
	public void keyTyped(KeyEvent e) {
		//We are not handling any keyboard events yet
	}
	public void keyPressed(KeyEvent e) {
		//We are not handling any keyboard events yet
	}
	public void keyReleased(KeyEvent e) {
		//We are not handling any keyboard events yet
	}
	
	public void mouseExited( MouseEvent evt ) { }
	public void mousePressed( MouseEvent evt ) {
		Component comp = evt.getComponent();
		if( comp.equals(this ) ) {
			requestFocus();
		}
	}
	public void mouseReleased( MouseEvent evt ) { }
	public void mouseClicked( MouseEvent evt ) {
		Component comp = evt.getComponent();
		if( comp.equals(this ) ) {
			requestFocus();
		}
	}
	/*----------[]--------------------------------------------------------------------------------*/
}