Scala LWJGL window template

lwjgl-empty-window.scala

import org.lwjgl.Version
import org.lwjgl.glfw._
import org.lwjgl.opengl.GL

println("LWJGL Version "+ Version.getVersion() +" is working.")

// Print to console on error
GLFW.glfwSetErrorCallback(
  GLFWErrorCallback.createPrint(System.err)
)

// Initialize GL
if (!GLFW.glfwInit()) {
    throw new IllegalStateException("Unable to initialize GLFW")
}

val window = GLFW.glfwCreateWindow(640, 480, "Simple example", 0, 0)
if (window == 0) {
  GLFW.glfwTerminate()
  throw new RuntimeException("Failed to create the GLFW window")
}

// Keypress callback
object keyCallback extends GLFWKeyCallback {
  def invoke(window: Long, key: Int, scancode: Int, action: Int, mods: Int) {
    if (key == GLFW.GLFW_KEY_ESCAPE && action == GLFW.GLFW_PRESS) {
      GLFW.glfwSetWindowShouldClose(window, true);
    }
  }
}

GLFW.glfwSetKeyCallback(window, keyCallback)

// Create OpenGL context
GLFW.glfwMakeContextCurrent(window);
GL.createCapabilities();

// Event loop
while (!GLFW.glfwWindowShouldClose(window)) {
  val time = GLFW.glfwGetTime()
  GLFW.glfwSwapBuffers(window)
  GLFW.glfwPollEvents()
}

// Window closed, shutting down
GLFW.glfwDestroyWindow(window);
keyCallback.free();

It isn't working actually.