Exception in thread "main" java.lang.RuntimeException: No OpenGL context found

Question

I've recently started to use the lwjgl and haven't run into any problems. Yesterday I went to create a new window (something I've done at least a dozen times, if not more) and it gave these errors when I ran it

Exception in thread "main" java.lang.RuntimeException: No OpenGL context found in the current thread.
    at org.lwjgl.opengl.GLContext.getCapabilities(GLContext.java:124)
    at org.lwjgl.opengl.GL11.glMatrixMode(GL11.java:2051)
    at Main.initGL(Main.java:10)
    at Main.main(Main.java:34)

My code is

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import static org.lwjgl.opengl.GL11.*;

public class Main
{
    public static void initGL()
    {
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(0, 640, 480, 0, 1, -1);
        glMatrixMode(GL_MODELVIEW);
    }

    public static void initDisplay()
    {
        try 
        {
            Display.setDisplayMode(new DisplayMode(480, 600));
            Display.setTitle("Texture Demo");
            Display.create();
        }

        catch (LWJGLException e) 
        {
            e.printStackTrace();
        }
        Display.update();
    }

    public static void main(String[] args)
    {
        initGL();
        initDisplay();
    }
}

I can't see any errors and like I said, I've ran this code before.

Check ***[this](http://stackoverflow.com/questions/14926929/java-lang-runtimeexception-no-opengl-context-found-in-the-current-thread)*** and ***[this](http://stackoverflow.com/questions/15950151/no-opengl-context-found-in-the-current-thread)*** posts — Extreme Coders, Apr 27 '13 at 07:17

score 3 · Answer 1 · edited Mar 06 '14 at 06:30

3

initGL and initDisplay are round the wrong way.

GL needs a context before you can start calling GL functions, so initDisplay() and then initGL().

edited Mar 06 '14 at 06:30

jozxyqk

16,424
12
91
180

answered Mar 06 '14 at 06:00

Bozygamemaker

31
2

Ersmes Mesina · Answer 2 · 2013-11-27T16:32:58.160

I have had this problem recently while making a game. The OpenGL initialization needs to be after the Display creation. And also, you must constantly update your Display or else it will immediately close on creation. An example here:

    public void run() {
        while(!Display.isCloseRequested) {
            Display.update()
            // Add repainting and input here
        }
    }

And add the "run" method in your "main" method

score 0 · Answer 3 · answered Jul 07 '13 at 18:41

0

If you change the init states it will work. So At first you have to do the initDisplay() beacuse the matrices will not find the OpenGL's display.

answered Jul 07 '13 at 18:41

Csoki

119
1
2
11

Exception in thread "main" java.lang.RuntimeException: No OpenGL context found

3 Answers3