Question

我正在关注应该显示窗口的this LWJGL Getting started guide，但我收到此错误，建议在主线程上运行并初始化AWT或JavaFX。怎么做到这一点？

我在VM选项中设置了-XstartOnFirstThread。我在使用MacOS 10.13.2

我通过在IDEA中选择一个新的Gradle项目来启动项目，然后我使用LWJGL Gradle生成器生成build.gradle。

我遵循installation guide中的IDEA步骤，但我不明白他们的意思（我不认为这与我的错误太相关）：

如果要完全匹配Maven / Gradle行为，可以创建2个单独的库：一个使用class + source .jar文件，使其成为模块的编译依赖项。一个使用natives .jar文件，使其成为模块的运行时依赖项。您可以在项目结构中执行此操作＆gt;模块＆gt;选择一个模块＆gt; “依赖关系”选项卡，通过更改每个依赖关系的范围。

“gradle run”错误：

Exception in thread "main" java.lang.ExceptionInInitializerError
at org.lwjgl.glfw.GLFW.glfwCreateWindow(GLFW.java:1694)
at com.javagame.kasha.HelloWorld.init(HelloWorld.java:51)
at com.javagame.kasha.HelloWorld.run(HelloWorld.java:24)
at com.javagame.kasha.HelloWorld.main(HelloWorld.java:114)
Caused by: java.lang.IllegalStateException: GLFW windows may only be created on the main thread and that thread must be the first thread in the process. Please run the JVM with -XstartOnFirstThread. For offscreen rendering, make sure another window toolkit (e.g. AWT or JavaFX) is initialized before GLFW.
at org.lwjgl.glfw.EventLoop$OffScreen.<clinit>(EventLoop.java:39)
... 4 more
:run FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':run'.
> Process 'command   '/Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/bin/java''   finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED in 0s

HelloWorld.java（从指南中复制，我添加了一个包，所以我可以使用Gradle应用程序插件启动它）：

package com.javagame.kasha;

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

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 HelloWorld {

// The window handle
private long window;

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

    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(300, 300, "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 the rendering loop
    });

    // 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 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(1.0f, 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) ) {
        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) {
    new HelloWorld().run();
}

}

的build.gradle：

group 'javagame'
version '1.0-SNAPSHOT'


import org.gradle.internal.os.OperatingSystem

switch ( OperatingSystem.current() ) {
    case OperatingSystem.WINDOWS:
        project.ext.lwjglNatives = "natives-windows"
        break
    case OperatingSystem.LINUX:
        project.ext.lwjglNatives = "natives-linux"
        break
    case OperatingSystem.MAC_OS:
        project.ext.lwjglNatives = "natives-macos"
        break
}


apply plugin: 'java'
apply plugin: 'application'

sourceCompatibility = 1.8
project.ext.lwjglVersion = "3.1.5"

repositories {
    mavenCentral()
}

mainClassName = "com.javagame.kasha.HelloWorld"

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile "org.lwjgl:lwjgl:$lwjglVersion"
    compile "org.lwjgl:lwjgl-assimp:$lwjglVersion"
    compile "org.lwjgl:lwjgl-glfw:$lwjglVersion"
    compile "org.lwjgl:lwjgl-openal:$lwjglVersion"
    compile "org.lwjgl:lwjgl-opengl:$lwjglVersion"
    compile "org.lwjgl:lwjgl-stb:$lwjglVersion"
    compile "org.lwjgl:lwjgl:$lwjglVersion:$lwjglNatives"
    compile "org.lwjgl:lwjgl-assimp:$lwjglVersion:$lwjglNatives"
    compile "org.lwjgl:lwjgl-glfw:$lwjglVersion:$lwjglNatives"
    compile "org.lwjgl:lwjgl-openal:$lwjglVersion:$lwjglNatives"
    compile "org.lwjgl:lwjgl-opengl:$lwjglVersion:$lwjglNatives"
    compile "org.lwjgl:lwjgl-stb:$lwjglVersion:$lwjglNatives"
}

Answer 1

这是与我的Gradle配置和应用程序插件相关的问题。解决方案是直接将参数放在build.grade中，而不是运行配置：

applicationDefaultJvmArgs = ["-XstartOnFirstThread"]

LWJGL Hello World抛出异常

1 个答案: