java.lang.NoClassDefFoundError: uno/glfw/HWND

[doceazedo]

I'm trying to use this library in a Minecraft mod, but the wiki seems to be very outdated (#113).

The game is crashing when I create a new context (line 4 below):

static {
    ImguiKt.MINECRAFT_BEHAVIORS = true;
    GlfwWindow window = new GlfwWindow(MinecraftClient.getInstance().getWindow().getHandle());
    new Context();
    implGlfw = new ImplGlfw(window, false, null);
    implGl3 = new ImplGL3();
}

Full code

```java package com.doceazedo.screen; import com.doceazedo.ExampleMod; import imgui.ImGui; import imgui.ImguiKt; import imgui.classes.Context; import imgui.classes.IO; import imgui.impl.gl.ImplGL3; import imgui.impl.glfw.ImplGlfw; import net.fabricmc.api.EnvType; import net.fabricmc.api.Environment; import net.minecraft.client.MinecraftClient; import net.minecraft.client.gui.DrawContext; import net.minecraft.client.gui.screen.Screen; import net.minecraft.text.Text; import org.slf4j.Logger; import uno.glfw.GlfwWindow; import java.util.*; @Environment(EnvType.CLIENT) public class ImguiScreen extends Screen { private static ImGui imgui = ImGui.INSTANCE; private static ImplGL3 implGl3; private static ImplGlfw implGlfw; private static IO ImGuiIO; private static HashSet keyBuffer = new HashSet(); public ImguiScreen() { super(Text.of("ImguiScreen")); } // Initialization for imgui. static { ImguiKt.MINECRAFT_BEHAVIORS = true; GlfwWindow window = new GlfwWindow(MinecraftClient.getInstance().getWindow().getHandle()); new Context(); implGlfw = new ImplGlfw(window, false, null); implGl3 = new ImplGL3(); } // Prevents Minecraft from pausing the game whenever we open the GUI. @Override public boolean shouldPause() { return false; } // Tells imgui to enter a character, when typing on a textbox or similar. @Override public boolean charTyped(char chr, int keyCode) { if (ImGuiIO.getWantTextInput()) { ImGuiIO.addInputCharacter(chr); } super.charTyped(chr, keyCode); return true; } // Passes mouse scrolling to imgui. @Override public boolean mouseScrolled(double d, double e, double amount) { if (ImGuiIO.getWantCaptureMouse()) { ImGuiIO.setMouseWheel((float) amount); } super.mouseScrolled(d, e, amount); return true; } // Passes keypresses for imgui to handle. @Override public boolean keyPressed(int keyCode, int scanCode, int modifiers) { if (ImGuiIO.getWantCaptureKeyboard()) { ImGuiIO.getKeysDown()[keyCode] = true; keyBuffer.add(keyCode); } // Skip handling of the ESC key, because Minecraft uses it to close the screen. if (keyCode == 256) { ImGuiIO.getKeysDown()[256] = false; } super.keyPressed(keyCode, scanCode, modifiers); return true; } // Tells imgui the keys pressed have been released. @Override public boolean keyReleased(int keyCode, int scanCode, int modifiers) { ImGuiIO.getKeysDown()[keyCode] = false; keyBuffer.remove(keyCode); super.keyReleased(keyCode, scanCode, modifiers); return true; } @Override public void close() { // When Minecraft closes the screen, clear the key buffer. for (int keyCode: keyBuffer) { ImGuiIO.getKeysDown()[keyCode] = false; } keyBuffer.clear(); super.close(); } @Override public void render(DrawContext context, int mouseX, int mouseY, float delta) { ImGuiIO = imgui.getIo(); implGl3.newFrame(); implGlfw.newFrame(); imgui.newFrame(); imgui.showDemoWindow(new boolean[]{true}); imgui.render(); implGl3.renderDrawData(Objects.requireNonNull(imgui.getDrawData())); } } ```

With the following error:

[Render thread/ERROR] (Minecraft) Unreported exception thrown!
 java.lang.NoClassDefFoundError: uno/glfw/HWND
    at imgui.classes.IO.<init>(IO.kt:156) ~[imgui-core-1.79+05.jar:?]
    at imgui.classes.Context.<init>(Context.kt:37) ~[imgui-core-1.79+05.jar:?]
    at imgui.classes.Context.<init>(Context.kt:30) ~[imgui-core-1.79+05.jar:?]
    at imgui.classes.Context.<init>(Context.kt) ~[imgui-core-1.79+05.jar:?]
    at com.doceazedo.screen.ImguiScreen.<clinit>(ImguiScreen.java:45) ~[client/:?]
    at com.doceazedo.ExampleModClient.initializeKeybinds$lambda$0(ExampleModClient.kt:34) ~[client/:?]
    at net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents.lambda$static$2(ClientTickEvents.java:43) ~[fabric-lifecycle-events-v1-client-2.2.21+b3afc78b77.jar:?]
    at net.minecraft.client.MinecraftClient.handler$zcp000$fabric-lifecycle-events-v1$onEndTick(MinecraftClient.java:4522) ~[minecraft-clientonly-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
    at net.minecraft.client.MinecraftClient.tick(MinecraftClient.java:1957) ~[minecraft-clientonly-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
    at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1181) ~[minecraft-clientonly-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
    at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:802) ~[minecraft-clientonly-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
    at net.minecraft.client.main.Main.main(Main.java:250) ~[minecraft-clientonly-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) ~[dev-launch-injector-0.2.1+build.8.jar:?]
Caused by: java.lang.ClassNotFoundException: uno.glfw.HWND
    at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?]
    at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:226) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.22.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?]
    ... 16 more
Caused by: java.lang.ClassNotFoundException: uno.glfw.HWND

The discussion points here are:

• GlfwWindow.from(handle) doesn't seem to exist anymore. I updated it to new GlfwWindow(handle). Is that correct?
• window.makeContextCurrent() also doesn't seem to exist anymore. What should be used instead?
• Any hints on what could be causing the java.lang.NoClassDefFoundError: uno/glfw/HWND error?
• I had to manually add the uno-sdk dependency. Does that have anything to do with the points above?

If we can get this fixed, I'm more than willing to update the docs/wiki/readme.

Thanks!

[elect86]

Hello DoceAzedo,

in Uno I decoupled the OpenGL related stuff from GlfwWindow, in order to have GlWindow for OpenGL and VkWindow, later on, for Vulkan

If you need Opengl, use GlWindow now, which extends GlfwWindow in turns, all the methods you mentioned are there

Is the project public? I might look into that

I'll send you an invitation for the updating

[doceazedo]

Thanks for your reply!

I see, but GlWindow still doesn't seem to have the from method tho... so I tried using GlWindow in a similar way I was doing in the original post, but the error is the same:

ImguiKt.MINECRAFT_BEHAVIORS = true;
GlfwWindow glfwWindow = new GlfwWindow(MinecraftClient.getInstance().getWindow().getHandle());
GlWindow window = new GlWindow(glfwWindow, Caps.Profile.COMPATIBILITY, true);

// This doesn't seem to make any difference, as it's already being called when GlWindow is built:
window.makeCurrent(true); 

// Crashing here: `java.lang.NoClassDefFoundError: uno/glfw/HWND`
new Context();

implGlfw = new ImplGlfw(window, false, null);
implGl3 = new ImplGL3();

I uploaded the full source code here. I was using breadbyte/fabric-example-imgui and the wiki as references. The relevant class can be found here.

[doceazedo]

Welp, after a little more digging I think uno/glfw/HWND does not, in fact, exist:

I followed the stack trace to imgui-core's file IO.kt and noticed it is trying to import uno.glfw.HWND, which does not exist, instead of uno.kotlin.HWND. Does this work anywhere else?

I'm not sure where the source code for this resides so it's hard to debug it any further.

[doceazedo]

Got it! 🥳

Seems like I was using 1.79+05 as the README told me to, instead of the latest version, 1.89.7.

I had to add the Jitpack repo so sealed-enum would stop complaining:

repositories {
    maven {
        url "https://raw.githubusercontent.com/kotlin-graphics/mary/master"
    }
    maven {
        url "https://jitpack.io"
    }
}

I will now get the mouse click to work (only mouse hover is working atm for some reason) and clean up the code. When I get everything right I will update the docs.

Thanks for you help :)