Hi,
I have very little knowledge about Springboot and it dates from a training I had a few years back.
But I’d say this is the kind of errors you may get because things are constantly moving in IT, especially programming APIs.
For what I understand the message appears because you are calling a restricted method java.Lang.System::load. As well as a deprecated method sun.misc.Unsafe::staticFieldBase.
Hopefully anyone taking the course could provide more info, but I wouldn’t wait for an answer and continue investigate.
Note that the message is not an error but a warning and may or may not be the reason the build fails.
Aren’t there other messages stating there is an error ?
I think you should start reading this
Good luck.
Cheers.