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Update to the latest version of Java 8. https://adoptopenjdk.net

Please provide your installer log, it will have the same name as the installer but with .log on the end: Installer: forge-{version}-installer.jar Log: forge-{version}-installer.jar.log Note: If you have Windows Explorer set to hide file extensions(as is the default setting), they will look like this: Installer: forge-{version}-installer Log: forge-{version}-installer.jar Edit: Wait a sec, why are you installing THAT version of Forge?

Use Minecraft's Structure Blocks to save a structure to NBT, which you can then use in code to load the structure. Create a new Template instance with the resource location of your structure.nbt file, and call Template#addBlocksToWorld to spawn the structure. You can do this in your WorldGenerator class.