Re: [jetty-dev] Jetty upgrade from 8.1.4 to 9.4.5 - Error
Sorry but there is not enough information here to say anything. The stack trace doesn't actually report anything wrong, it just is a strack trace. It is in sendError, but nothing is reported that indicates what the error is or if it is normal/expected or not.
Can you try to make small reproducible test case that demonstrates what the problem is?