Setting up the project with code autocompletion.

[HakiSume]

I been lurking around in google for many days now to find how to integrate Javadocs of zomboid. I've read through most of the tutorials included on wiki, but neither of them show how to set it up. I found plenty of projects like Caspid, ZombieDoc, Storm and etc. But neither of them work for me. For example caspid throws error like this 

Execution failed for task ':zomboidVersion'.
> Process 'command 'C:\Program Files (x86)\OpenJDK\jdk-8.0.262.10-hotspot\bin\java.exe'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

while running setUpWorkspace. ZombieDoc doesnt work for me at all and i didnt try Storm as i want to mod in Lua, not java.
Is there any other way to include autocompletion, or at least fix the error?
For any help big thanks.