This has happened long before we had to customise the jre used, though in those days it was oracle anyway.
Even so it’s a fair suggestion to check if the error happens on a fresh knime install. I’ll have a look.
Changing the workspace location shouldn’t really matter we see this error on multiple machines.
It’s not so much miss remembering a location as it is a breakage of a link to the workflow directory which then corrupts the workflow. The workflow neeeds to be closed and reopened to be able to access the data table properly again. I’ve not spotted that issue you mention myself but will keep an eye out.
I deliberately didn’t share the whole log file and workflow publicly. If I can reproduce it on a clean knime install I’ll upload.
Cheers
Sam
P. S. Whoops seems I asked this same thing 4 years ago