Bug:ImGui-java Causing Memory Leak with Specific UI Sort/Layout

[Xinkong-xk]

Version

1.89.0 (new) and 1.86.12 (old)

What happened?

A bug happened!
I am not sure how this bug occurs, and I haven't been able to identify a consistent pattern for its appearance. The issue manifests as a rapid increase in the number of “java.nio.DirectIntBufferU” objects after building the UI in a certain way, eventually leading to a memory leak.

I have observed this bug in multiple versions. I first discovered it accidentally while using version 1.86.12. Later, I upgraded to 1.89.0 and switched to using imgui-app as the windowing platform for testing, but the bug still occurred.

This bug does not cause any exceptions or crashes, but it leads to a continuous and significant increase in memory usage. I directly copied the initial test code recommended on the imgui-java homepage, and then added 6 windows along with several ImGui.text calls. I noticed that this bug only occurs when these windows and text calls are arranged in a certain specific pattern. For example, if I remove the last window (Window 6), the bug disappears. Therefore, I cannot summarize a consistent pattern that triggers the bug.

Reproduction

import imgui.ImGui;
import imgui.app.Application;
import imgui.app.Configuration;

// From the home page of imgui-java 
public class Main extends Application {
	@Override
	protected void configure(Configuration config) {
		config.setTitle("Dear ImGui is Awesome!");
	}

	@Override
	public void process() {
		// window 1
		imgui.internal.ImGui.begin("a1");
		// end
		imgui.ImGui.end();

		// window 2
		if (imgui.internal.ImGui.begin("a2")) {
			imgui.internal.ImGui.text("1");
		}
		// end
		imgui.ImGui.end();

		// window 3
		if (imgui.internal.ImGui.begin("a3")) {
			imgui.internal.ImGui.text("2");
		}
		// end
		imgui.ImGui.end();

		// window 4
		if (imgui.internal.ImGui.begin("a4")) {
			imgui.internal.ImGui.text("3");
		}
		// end
		imgui.ImGui.end();

		// window 5
		imgui.internal.ImGui.begin("a5");
		// end
		imgui.ImGui.end();

		// window 6
		imgui.internal.ImGui.begin("a6");
		// end
		imgui.ImGui.end();
	}

	public static void main(String[] args) {
		launch(new Main());
	}
}

Relevant log output

// No error but memory leak.
// Object Type : "java.nio.DirectIntBufferU"
// Tool : Jprofiler , IDEA

[Xinkong-xk]

Is this a bug caused by my incorrect coding?

[Xinkong-xk]

Is anybody there？

[SpaiR]

It's hard to say anything specific about your problem. The code looks ok, so the issue just need an investigation.

[Xinkong-xk]

I’m not sure if this bug is caused by my device or system. This is the result of my testing. If you have time, you can also try running that code and use Task Manager or Java monitoring tools to check if there are any abnormal memory leaks. Thank you.