Github user afs commented on a diff in the pull request: https://github.com/apache/jena/pull/384#discussion_r174896205 --- Diff: jena-arq/src/main/java/org/apache/jena/sparql/core/GraphView.java --- @@ -146,7 +148,7 @@ private static Node graphNode(Node gn) { public void performAdd( Triple t ) { Node g = graphNode(gn) ; if ( Quad.isUnionGraph(g) ) - throw new GraphViewException("Can't update the default union graph of a dataset") ; + throw new AddDeniedException("Can't update the union graph of a dataset") ; --- End diff -- It's pushing the "contract". "Denied" suggests to me that it could work in other circumstances but the tests said this was expected so this is what you get.
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