When virtual threads are enabled, embedded Jetty does not use recommended virtual thread configuration

[nstdio]

When running Spring Boot web application with spring.threads.virtual.enabled=true the JettyVirtualThreadsWebServerFactoryCustomizer creates and configures QueuedThreadPool and sets it on factory. Please note following default values:

• server.jetty.threads.min=8
• server.jetty.threads.max=200
• server.jetty.threads.idle-timeout=60000ms

This results in virtual threads being reused which I believe is not advised. Also documentation indicates org.eclipse.jetty.util.thread.VirtualThreadPool as preferred way to configure virtual threads support.

[snicoll]

Thanks for the report. This class was made available as of Jetty 12.0.10 which probably explains why we didn't use it back then. I am wondering if that's worth backporting @bclozel