Help with NPE (Processing & Netbeans)

Programming Questions

lemanou

Help with NPE (Processing & Netbeans)

in Programming Questions • 7 months ago

Can someone help me with this NPE?

I am trying to move my sketch (which runs perfectly in processing IDE) in netbeans and when I run it I get this NPE.

In my sketch I create in the main class an object from the second one and call the .display function.

Exception in thread "Animation Thread" javax.media.opengl.GLException: java.lang.NullPointerException

at jogamp.opengl.awt.AWTThreadingPlugin.invokeOnOpenGLThread(AWTThreadingPlugin.java:98)

at jogamp.opengl.ThreadingImpl.invokeOnOpenGLThread(ThreadingImpl.java:196)

at javax.media.opengl.Threading.invokeOnOpenGLThread(Threading.java:164)

at javax.media.opengl.awt.GLCanvas.maybeDoSingleThreadedWorkaround(GLCanvas.java:831)

at javax.media.opengl.awt.GLCanvas.display(GLCanvas.java:419)

at processing.opengl.PGL.requestDraw(Unknown Source)

at processing.opengl.PGraphicsOpenGL.requestDraw(Unknown Source)

at processing.core.PApplet.run(Unknown Source)

at java.lang.Thread.run(Thread.java:662)

Caused by: java.lang.NullPointerException

at processing.core.PApplet.lights(Unknown Source)

at org.me.ClearDay.display(ClearDay.java:18)

at org.me.WeatherApplet.draw(WeatherApplet.java:76)

at processing.core.PApplet.handleDraw(Unknown Source)

at processing.opengl.PGL$PGLListener.display(Unknown Source)

at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:189)

at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:177)

at javax.media.opengl.awt.GLCanvas$DisplayAction.run(GLCanvas.java:934)

at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:425)

at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:364)

at javax.media.opengl.awt.GLCanvas$DisplayOnEventDispatchThreadAction.run(GLCanvas.java:951)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)

at java.awt.EventQueue.access$000(EventQueue.java:84)

at java.awt.EventQueue$1.run(EventQueue.java:607)

at java.awt.EventQueue$1.run(EventQueue.java:605)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Thanks in advance!

Replies(12)

monkstone

Re: Help with NPE (Processing & Netbeans)

7 months ago

Have you seen this link http://martinpblogformasswritingproject.blogspot.co.uk/2012/07/setting-up-netbeans-72-for-processing-20.html. Basically you need to create a path all the runtime libraries you require in NetBeans. Since processing-2.0 JOGL/OPENGL runtime are placed in a jar, otherwise for processing-1.5.1 you have to pass the path to native libs (*.so, *.dll etc) on the java commandline.

lemanou

Re: Re: Help with NPE (Processing & Netbeans)

7 months ago

Thank you for your answer, although I have already done that.

I have added the libs and I can run the sketches independently.

However, if I create one sketch with an OO approach it does not work and I get this NPE.

From the main class I initialise the objects in the setup method, works fine - I put system.out and I get the output.

In the draw method I call a display (which replaced draw) method which is in the next class.

That call gives me the exception.

Do you have anything in mind?

PhiLho

Re: Help with NPE (Processing & Netbeans)

7 months ago

You have an exception in the lights() method (so you use 1.5.1, right?), which can be caused only because g is not initialized.
Not sure what your code looks like, so it is hard to tell more.

lemanou

Re: Re: Help with NPE (Processing & Netbeans)

7 months ago

The thing is that in the processing IDE it runs perfectly and when I run it alone(Class B with setup and draw) in netbeans it runs again.

Here is the code:

Main class:

package org.me;

import java.security.AccessController;

import java.security.PrivilegedAction;

import processing.core.*;

public class WeatherApplet extends PApplet {

ClearDay a = null;

Cloudy b = null;

FewClouds c = null;

Fog d = null;

HeavyRain e = null;

LightRain f = null;

LightSnow gL = null;

Sleet h = null;

Snow i = null;

Storm j = null;

ThinClouds k = null;

NoData l = null;

String[] MyArray = {

"ClearDay", "Cloudy", "FewClouds", "Fog", "HeavyRain", "LightRain", "LightSnow",

"Sleet", "Snow", "Storm", "ThinClouds"};

String TheInput = "ClearDay";

int index = 0, input = 0;

//String inputFromPage = this.getParameter("myParameter");

public void setup() {

//TheInput = inputFromPage;

// Defines the dimension of the display window in units of pixels.

size(200, 200, OPENGL);

// Draws all geometry with smooth (anti-aliased) edges. it will also improves image quality of resized images.

smooth();

// Specifies the number of frames to be displayed every second.

frameRate(24);

a = new ClearDay();

/*b = new Cloudy();

c = new FewClouds();

d = new Fog();

e = new HeavyRain();

f = new LightRain();

gL = new LightSnow();

gL.toStart();System.out.println("aaaSetup");

h = new Sleet();

h.toStart();

i = new Snow();

i.toStart();

j = new Storm();

j.toStart();

k = new ThinClouds();

l = new NoData();*/

}

public void draw() {

background(0, 191, 255, 0);

while (index < MyArray.length) {

if (TheInput.equals(MyArray[index])) {

input = index + 1;

System.out.println(MyArray[index]);

}

index += 1;

}

System.out.println("1aaaDraw");

switch (input) {

case 1:

System.out.println("2aaaDraw");

a.display();

System.out.println("3aaaDraw");

break;

case 2:

b.display();

break;

case 3:

c.display();

break;

case 4:

d.display();

break;

case 5:

e.display();

break;

case 6:

f.display();

break;

case 7:

gL.display();

break;

case 8:

h.display();

break;

case 9:

i.display();

break;

case 10:

j.display();

break;

case 11:

k.display();

break;

default:

l.display();

break;

}

public static void main(String[] args) {

PApplet.main(new String[]{org.me.WeatherApplet.class.getName()});

}

public void killApplet() {

AccessController.doPrivileged(new PrivilegedAction() {

public Void run() {

// kill the JVM

System.exit(0);

return null;

}

});

}

Class B

package org.me;

import processing.core.*;

public class ClearDay extends PApplet {

public void display() {

// put some lighting on our object

lights();

// Disables filling geometry.

noFill();

// Sets the color used to draw lines and borders around shapes.

stroke(0);

// Sets the width of the stroke used for lines, points, and the border around shapes.

strokeWeight(1);

// Specifies an amount to displace objects within the display window.

translate(width / 2, height / 2);

// The system variable frameCount contains the number of frames that have been displayed since the program started.

double x = frameCount * 0.01;

// Rotates a shape the amount specified by the angle parameter.

rotateY((float) x);

// Color(R,G,B,Alpha)

stroke(255, 215, 0, 70);

// 30 for 300

strokeWeight(30);

// A sphere is a hollow ball made from tessellated triangles.

sphere(50);

}

PhiLho

Re: Help with NPE (Processing & Netbeans)

7 months ago

Why is ClearDay extending PApplet? In general, you should have only one PApplet per sketch (unless you create separate frames, perhaps). Here, your second PApplet doesn't have a setup(), so g isn't initialized.
You should pass the WeatherApplet instance (this) to the ClearDay constructor instead, or nest ClearDay into WeatherApplet, like it is done in the PDE.

lemanou

Re: Help with NPE (Processing & Netbeans)

7 months ago

If I dont extend it with PApplet I cant use lights(), noFill(), etc methods.

I have only one frame which comes from WeatherApplet. There is setup in WeatherApplet so shouldn't g be initialized?

And what should I do with the WeatherApplet instance in ClearDay?

Strange that almost the same code runs in the PDE. (without the extensions)

Thank you for your time.

lemanou

Re: Re: Help with NPE (Processing & Netbeans)

7 months ago

This gives the same error - removed the extend PApplet and made it a subclass

Main Class

package org.me;

import processing.core.*;

public class TryOut extends PApplet {

ClearDay a = null;

public void setup() {

size(200, 200, P3D);

smooth();

frameRate(24);

a = new ClearDay();

}

public void draw() {

background(0, 191, 255, 0);

a.display();

}

public static void main(String[] args) {

PApplet.main(new String[]{org.me.TryOut.class.getName()});

}

Class B

package org.me;

public class ClearDay extends TryOut {

public void display() {

// put some lighting on our object

lights();

// Disables filling geometry.

noFill();

// Sets the color used to draw lines and borders around shapes.

stroke(0);

// Sets the width of the stroke used for lines, points, and the border around shapes.

strokeWeight(1);

// Specifies an amount to displace objects within the display window.

translate(width / 2, height / 2);

// The system variable frameCount contains the number of frames that have been displayed since the program started.

double x = frameCount * 0.01;

// Rotates a shape the amount specified by the angle parameter.

rotateY((float) x);

// Color(R,G,B,Alpha)

stroke(255, 215, 0, 70);

// 30 for 300

strokeWeight(30);

// A sphere is a hollow ball made from tessellated triangles.

sphere(50);

}

PhiLho

Re: Help with NPE (Processing & Netbeans)

7 months ago

I wrote "nested class", not sub-class!
Also see the Technical FAQ, particularly Why I can't create an instance of a library from my own classes? for an explanation about passing 'this' to the constructor of the other class.

lemanou

Re: Re: Help with NPE (Processing & Netbeans)

7 months ago

Thank you for the info!

If I make them all nested with a case-switch it works fine, once.

What I mean is, that I export the sketch as a .jar applet and run it from a web app.

When I change the parameter and the case change too I get

Adding same VBO twice

Adding same glsl program twice

Adding same glsl vertex shader twice

Adding same glsl fragment shader twice

Is there a way to restart the applet or a method to put in the sketch? I tryed redraw(); with no result. :/

lemanou

Re: Help with NPE (Processing & Netbeans)

7 months ago

Also by passing the WeatherApplet instance (this) to the ClearDay constructor it works but the output is frozen and does not move at all, like it only has looped once.

PhiLho

Re: Help with NPE (Processing & Netbeans)

7 months ago

It looks like when you reload the page, you have to close properly the applet, disposing of the OpenGL resources.
I have little OpenGL experience, even less in the browser, so I fear I can't help you more.

lemanou

Re: Re: Help with NPE (Processing & Netbeans)

7 months ago

Yes thats what I am searching for.

And there I thought your knowledge was infinite! xD

Thank you for the information. :)

Top Reply