How to set size to this Scrollpane?

Question

https://code.sololearn.com/cr76tA4L1I0W/?ref=app

While the frame initializes at preferred size, the Scrollpane grows to full available space.
Besides that, no other layout component is shown (or respected).

The intent is to mirror a console, to describe it in borderlayout, placing the text in the center and having an input reader at page_end.

There is this text based adventure that I want to run on its own. I wrote this to text the GUI not waiting for the game mechanics all the time.

I'm very thankful for your help even if its just keywords to Google :)

Ps: I hope that code snippet fits the guidelines of this community, I copy pasted it and someone would complain, if there was anything missing as well... ^^°

Note: BoxLayout is set on X-axis cause I thought it might at least put the components side by side if not on top of each other... Didn't work.

Update: used sololearn search with "Scrollpane", came up with two results, both didn't work

Answer 1

It needs debugging