sorry for the delay as I had to ask a colleague. We also suspect it could simply be an authentication problem and the error is choking on the response. For authentication against the remote endpoint it will check the records available on the Password Management page, and if there is any that exactly matches the SERVICE URI, then that user name and password will be used with basic auth for making the request. So I believe your first example should work if you have a username/password for https://example.org/edg/tbl/sparql and then use the GRAPH keyword. I doubt the second variation with the ? argument will work.
If you could give that a try?
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I don't know how to help further. The error is from within Jena code, and only a proper Java debugger or network monitor could find out where it's failing, e.g. what the remote server response is.
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