1. Using 3dGuiApi

Common build tools:

Maven:

<repositories>
	<repository>
		<id>jitpack.io</id>
		<url>https://jitpack.io</url>
	</repository>
</repositories>

<dependency>
	<groupId>com.github.LitleProgrammer</groupId>
	<artifactId>3-gui-api</artifactId>
	<version>Tag</version>
</dependency>

Gradle:

repositories {
	maven { url 'https://jitpack.io' }
}

dependencies {
	implementation 'com.github.LitleProgrammer:3-gui-api:Tag'
}

Initialize in your main

public class Main extends JavaPlugin {

    @Override
    public void onEnable() {
        GuiApi guiApi = new GuiApi(this).init();
    }

}