QueryCancelledException not being caught in Fuseki
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Key: JENA-158
URL: https://issues.apache.org/jira/browse/JENA-158
Project: Jena
Issue Type: Improvement
Components: Fuseki
Reporter: Alexander Dutton
Priority: Minor
[This is a reformulation of
http://mail-archives.apache.org/mod_mbox/incubator-jena-dev/201111.mbox/%3C4EBAA0A3.8%40oucs.ox.ac.uk%3E
and following messages]
When a query times out the client currently receives the following, which
doesn't explain much:
> Error 500: Server Error
This is the result of a QueryCancelledException being caught at line 107 of
SPARQL_ServletBase, which has the comment "This should not happen"
It'd be good if this were explicitly caught and a more user-friendly error
message provided.
I don't know what HTTP status code should be provided; the SPARQL spec says
500, but that upsets me (and Hugh Glaser)¹. Andy points out that it should be a
5xx status code². I've started a thread on ietf-http-wg asking for something
along the lines of a "Request Too Onerous" status code.³
¹ http://lists.w3.org/Archives/Public/public-lod/2011Apr/0259.html
² http://lists.w3.org/Archives/Public/public-lod/2011Apr/0268.html
³ http://lists.w3.org/Archives/Public/ietf-http-wg/2011OctDec/0188.html
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