Seems caused by JDK-8341696. Happened on multiple platforms in the nightlies.


The error output looks like -

===== DaCapo 23.11-MR1-chopin spring starting =====
Starting 131072 requests...
Unexpected response. Thread-9 got 505 for request 8655: GET /resources/images/favicon.png
Unexpected response. Thread-2 got 505 for request 8702: GET /vets.html
Unexpected response. Thread-3 got 505 for request 8777: GET /webjars/bootstrap/dist/js/bootstrap.bundle.min.js
Unexpected response. Thread-1 got 505 for request 8801: GET /owners/4317
Unexpected response. Thread-7 got 505 for request 8786: GET /
Unexpected response. Thread-4 got 505 for request 8733: GET /owners/find
Unexpected response. Thread-1 got 505 for request 8802: GET /resources/images/favicon.png
Unexpected response. Thread-8 got 505 for request 8848: GET /resources/images/pets.png
Unexpected response. Thread-3 got 505 for request 8778: GET /owners/4381/pets/6515/visits/new
Unexpected response. Thread-9 got 505 for request 8832: GET /resources/images/favicon.png
Unexpected response. Thread-2 got 505 for request 8703: GET /resources/images/favicon.png
Unexpected response. Thread-6 got 505 for request 8761: GET /resources/images/favicon.png
Unexpected response. Thread-10 got 505 for request 8747: POST /owners/4443/edit/&firstName=Kyle&lastName=Brown&address=916 WrigZt Pl.&telephone=482878206
Unexpected response. Thread-5 got 505 for request 8817: GET /owners/find
Unexpected response. Thread-6 got 505 for request 8762: GET /
Unexpected response. Thread-8 got 505 for request 8849: GET /vets.html
Unexpected response. Thread-4 got 505 for request 8734: GET /webjars/bootstrap/dist/js/bootstrap.bundle.min.js
Unexpected response. Thread-7 got 505 for request 8787: GET /owners/find
Unexpected response. Thread-5 got 505 for request 8818: GET /vets.html
Unexpected response. Thread-10 got 505 for request 8748: GET /