Github user afs commented on the issue:
https://github.com/apache/jena/pull/390
Hi there - thanks for the PR. There is a problem somewhere.
Looking at the RDF tutorial, it uses "http\://somewhere/JohnSmith" (no /)
so I think the problem in the data file vc-db-1.rdf (and other data files)
where they use `http://somewhere/JohnSmith/` (with /).---
