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The forge 1.13 version is very new. But optifine probably has no update to work in a forge 1.13 version. So you have to wait until optifine gets a update.

I've just completed my first Eclipse workspace setup for Minecraft mod development using Forge for Minecraft 1.13.2 I can successfully launch Minecraft 1.13.2 from inside Eclipse, with the mod properly loaded by Forge. You need to import the launch configurations in Eclipse. The launch configuration files, "client.launch" and "server.launch" can be found in the project root folder, after you ran "gradlew eclipse". To import then, go to File > Import... and then expand Run/Debug select Launch Configurations, and click Next. Browse and select your mod project root folder. Check the project checkbox in the left panel, and select the launch configurations in the right panel. Click Finish to import. Screenshots here: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0446g/CJADBBIA.html The imported launch configurations are available for usage now... go to Run > Run Configurations... and select the client configuration to launch Minecraft with your mod loaded.

You can post within an hour, it just has to be more substantial(meaning actually provide information) than just "bump".

Figured out that the client run config is broke and you need to run the gradlew runClient gradle task to launch the client for now

ItemStack doesn't know where it is. It just is. If in inventory, inventory knows tho. player.inventory.mainInventory - array of 36 player slots, you can iterate through them, check if there is an item and replace/move it. Or are we talking about other inventories? IInventory has getStackInSlot(index) or you can return whole array if you want and do same as above.