afs commented on PR #2329:
URL: https://github.com/apache/jena/pull/2329#issuecomment-1997302917

   > The test suite is less vulnerable 
   
   After running GH Windows actions repeatedly across the day and also running 
in batches of 3-5 at the same time, the test 
   suite is less vulnerable but not perfect.  
   
   So it will be good to get this PR into the codebase and then there is more 
work to be done.
   
   Usually, it is an auth test that fails, not always the same auth test. In an 
auth related test there are two HTTP requests - the first attempt results in a 
401 and the second with the authentication credentials. 
   
   But it is not exclusively auth tests failing. With groups of tests running 
at the same time, other tests fail sometimes (I'm guessing that a group of 
tests do share some underlying hardware).
   
   The common factor is creating a Fuseki Server in a Junit `@BeforeClass` and 
stopping it in `@AfterClass`.
   
   From previous Jena test stability experience, Windows behaves different to 
Linux in the timing of old ports being collected by the OS kernel and in the 
way that thread scheduling can cause longer pauses of a thread. That on its own 
isn't a deep explanation.
   


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