LWJGL 3 cube render

package xan_code;

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

import com.jogamp.opengl.glu.GLU;

import xan_code.entity.Player;
import xan_code.input.Keyboard;
import xan_code.input.Mouse;
import xan_code.util.Vector3;

import java.nio.*;

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

public class Main {

    // The window handle
    private long window;
    private Player player = new Player(); //This is a custom class. All it stores is a Position value, which is my custom Vector3 class (Which just stores an X, Y and Z float value)

    public void run() {
        init();
        loop();

        // Free the window callbacks and destroy the window
        glfwFreeCallbacks(window);
        glfwDestroyWindow(window);

        // Terminate GLFW and free the error callback
        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 GLFW
        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

        // Create the window
        window = glfwCreateWindow(1024, 768, "Xan's game", 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 the rendering loop
            }
            Keyboard.SetKey(window, key, scancode, action, mods);
        });


        // Get the thread stack and push a new frame
        try ( MemoryStack stack = stackPush() ) {
            IntBuffer pWidth = stack.mallocInt(1); // int*
            IntBuffer pHeight = stack.mallocInt(1); // int*

            // Get the window size passed to glfwCreateWindow
            glfwGetWindowSize(window, pWidth, pHeight);

            // Get the resolution of the primary monitor
            GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());

            // Center the window
            glfwSetWindowPos(
                window,
                (vidmode.width() - pWidth.get(0)) / 2,
                (vidmode.height() - pHeight.get(0)) / 2
            );
        } // the stack frame is popped automatically

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

        // Make the window visible
        glfwShowWindow(window);
    }

    private void Render() {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        GLU.gluPerspective(80, 4/3, 0.1, 10000); //Faulty line right here.

        glTranslatef(player.Position.X, player.Position.Y, player.Position.Z); //See line 27
        glRotatef(45f, 0, 1, 1);

        glBegin(GL11.GL_QUADS);
        glColor3f(10f,10f,0.0f);
        glVertex3f( 10f, 10f,-10f);
        glVertex3f(-10f, 10f,-10f);
        glVertex3f(-10f, 10f, 10f);
        glVertex3f( 10f, 10f, 10f);
        glColor3f(10f,10f,0.0f);
        glVertex3f( 10f,-10f, 10f);
        glVertex3f(-10f,-10f, 10f);
        glVertex3f(-10f,-10f,-10f);
        glVertex3f( 10f,-10f,-10f);
        glColor3f(10f,0.0f,0.0f);
        glVertex3f( 10f, 10f, 10f);
        glVertex3f(-10f, 10f, 10f);
        glVertex3f(-10f,-10f, 10f);
        glVertex3f( 10f,-10f, 10f);
        glColor3f(10f,10f,0.0f);
        glVertex3f( 10f,-10f,-10f);
        glVertex3f(-10f,-10f,-10f);
        glVertex3f(-10f, 10f,-10f);
        glVertex3f( 10f, 10f,-10f);
        glColor3f(0.0f,0.0f,10f);
        glVertex3f(-10f, 10f, 10f);
        glVertex3f(-10f, 10f,-10f);
        glVertex3f(-10f,-10f,-10f);
        glVertex3f(-10f,-10f, 10f);
        glColor3f(10f,0.0f,10f);
        glVertex3f( 10f, 10f,-10f);
        glVertex3f( 10f, 10f, 10f);
        glVertex3f( 10f,-10f, 10f);
        glVertex3f( 10f,-10f,-10f);
        glEnd();
    }

    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
        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

        // Run the rendering loop until the user has attempted to close
        // the window or has pressed the ESCAPE key.
        while ( !glfwWindowShouldClose(window) ) {
            Mouse.Update(window);

            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_W)) {
                player.Position = player.Position.add(new Vector3(0, 0, 0.1f));
            }
            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_S)) {
                player.Position = player.Position.subtract(new Vector3(0, 0, 0.1f));
            }
            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_A)) {
                player.Position = player.Position.add(new Vector3(0.1f, 0, 0));
            }
            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_D)) {
                player.Position = player.Position.subtract(new Vector3(0.1f, 0, 0));
            }
            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_Q)) {
                player.Position = player.Position.subtract(new Vector3(0, 0.1f, 0));
            }
            if (Keyboard.IsKeyDown(GLFW.GLFW_KEY_E)) {
                player.Position = player.Position.add(new Vector3(0, 0.1f, 0));
            }

            Render();
            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) {
        new Main().run();
    }

}