See issue https://github.com/eclipse/jetty.project/issues/4141 Running on java 12 + spring security 5.1.6 + jetty 9.4.21 - same mix worked with jetty 9.4.20

Comment From: joakime

Jetty has been able to replicate this issue without spring-security in the mix. A fix is being reviewed and a new release is likely.

Comment From: joakime

Jetty 9.4.22.v20191022 fixes this issue. (now available on Maven Central)

Comment From: spring-projects-issues

Fixed via 8fa16ce63e3ca8bfedbb6e19af89498704aa005d