Explain why run-nifi.bat closes

Hello all,

Here a frustrating issue that can be solved very easily : I follow the instructions here https://nifi.apache.org/documentation/v2/ in order to use nifi on windows.
So I launched the run-nifi.bat and it closes the windows almost immediatly, before I can read the message and apparently without logging anything. I lost a lost of time to find the issue... (a not up to date jdk). How did I do ? By using Greenshot to make a screenshot and luckily, I got the exact message.

So I would like a way to know why this window closes. I guess logging the issue to a file can be doable.
Best regards,
Simon