LWJGL Crash Issue

//-------LWJGLTest.java---------

import org.lwjgl.*;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;

import static org.lwjgl.glfw.Callbacks.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;

public class LWJGLTest extends Thread{
    // The window handle
    private long window;

    public void run() {
        new LWJGLTest();
        System.out.println("Hello LWJGL " + Version.getVersion() + "!");

        try {
            init();
            loop();
            System.out.println("ouch");

            // Free the window callbacks and destroy the window
            glfwFreeCallbacks(window);
            glfwDestroyWindow(window);
        } finally {
            // Terminate GLFW and free the error callback
            System.out.println("ouch");

            glfwTerminate();
            glfwSetErrorCallback(null).free();
        }
    }

    private void init() {
        // Setup an error callback. The default implementation
        // will print the error message in System.err.
        GLFWErrorCallback.createPrint(System.err).set();

        // Initialize GLFW. Most GLFW functions will not work before doing this.
        if ( !glfwInit() )
            throw new IllegalStateException("Unable to initialize GLFW");

        // Configure our window
        glfwDefaultWindowHints(); // optional, the current window hints are already the default
        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); // the window will stay hidden after creation
        glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // the window will be resizable

        int WIDTH = 300;
        int HEIGHT = 300;

        // Create the window
        window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World!", NULL, NULL);
        if ( window == NULL )
            throw new RuntimeException("Failed to create the GLFW window");

        // Setup a key callback. It will be called every time a key is pressed, repeated or released.
        glfwSetKeyCallback(window, (window, key, scancode, action, mods) -> {
            if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
                glfwSetWindowShouldClose(window, true); // We will detect this in our rendering loop
        });

        // Get the resolution of the primary monitor
        GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
        // Center our window
        glfwSetWindowPos(
            window,
            (vidmode.width() - WIDTH) / 2,
            (vidmode.height() - HEIGHT) / 2
        );

        // Make the OpenGL context current
        glfwMakeContextCurrent(window);
        // Enable v-sync
        glfwSwapInterval(1);

        // Make the window visible
        glfwShowWindow(window);
    }
    private float color = 1.0f;
    private void loop() {
        // This line is critical for LWJGL's interoperation with GLFW's
        // OpenGL context, or any context that is managed externally.
        // LWJGL detects the context that is current in the current thread,
        // creates the GLCapabilities instance and makes the OpenGL
        // bindings available for use.
        GL.createCapabilities();
        // Set the clear color

        // Run the rendering loop until the user has attempted to close
        // the window or has pressed the ESCAPE key.
        boolean increment = true;
        while ( !glfwWindowShouldClose(window) ) {
            if (increment) {
                color += 0.01f;
            } else {
                color -= 0.01f;
            }
            if (color > 1) {
                color = 1;
                increment = false;
            }
            if (color < 0) {
                color = 0;
                increment = true;
            }
            System.out.println("running...");
            glClearColor(color, (1f - color), 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer

            glfwSwapBuffers(window); // swap the color buffers
            // Poll for window events. The key callback above will only be
            // invoked during this call.
            glfwPollEvents();

        }
    }

    public static void main(String[] args) {
        //Test class contains a 5 second delay followed by loading ColorModel
        TestClass test = new TestClass();
        test.start();
        new LWJGLTest().run();
    }

}









//---------TestClass.java





import java.awt.image.ColorModel;

public class TestClass extends Thread{
    public void run() {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("About to run ColorModel.getRGBdefault()");
        try {
            ColorModel.getRGBdefault();
        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println("Ran successfully");
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}