Re: [PR] Debug ci failures [jena]

["afs (via GitHub)" <gi...@apache.org>]

afs commented on PR #3063:
URL: https://github.com/apache/jena/pull/3063#issuecomment-2797876988

   Hi @OyvindLGjesdal 
   
   We're seeing the same sort of thing.
   
   I think you may be on to something about `conn.update("CLEAR ALL")`.
   
   I can't explain why its always the same test that fails but one server per test + protected "CLEAR ALL" is working (caveat - its now a quieter time of day).
   
   I've got some changes that can go to a PR for `main` when cleaned up.
   
   The most annoying failure is `TestFusekiShaclValidation.shacl_no_data_graph` because it is in `jena-fuseki-main`, whereas the other typical failures are in `jena-integration-tests` which nothing depends. Running "fail at end" would at least continue most code checking.
   
   * reinforced the exception handling path to always consume a potential message and always close the connection,
   * Made tests run one server per test (code-change configurable to one per suite) - this reduces the failure rate to 1 in 10
   * Protected `conn.update("CLEAR ALL")` - the error rate on java test failures is zero
   * Move most of the typically failing tests into their own classes for convenience.
   
   These rates are job failures, runs of both Java17 and Java21, so the per-build twice as good (it is very rare to have both fail).
   The UI issue looks to be an unrelated random failure.
   


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