Joakim Erdfelt

When we break down your threaddump, we see ... ``` "embedded-jetty-177" #177 prio=5 os_prio=31 cpu=4.44ms elapsed=391.19s tid=0x000000011a9fe800 nid=0x1490b waiting on condition [0x000000028b73d000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park([email protected]/Native Method) - parking...

@lachlan-roberts you have at least 11 checkstyle errors to fix in this PR

You are using an old version of Jetty (version 9.4.20), upgrade (to at least 9.4.46) and try again. I don't think 9.4.20 supported what you are attempting to do. _Note:...

Also, Java 1.8_191 expired back on Feb 15, 2019. That JVM should not be used in production, for any reason. Especially so if you are using it on the public...

Is this easy to replicate? Two things ... 1. Try 11.0.8-SNAPSHOT available from the snapshot repository https://oss.sonatype.org/content/repositories/jetty-snapshots/ There is a lot of updates due for release 11.0.8, perhaps one of...

Seems like this already exists in the JVM ... * [`java.beans.PropertChangeListener`](https://docs.oracle.com/javase/8/docs/api/java/beans/PropertyChangeListener.html) * [`java.beans.PropertyChangeEvent`](https://docs.oracle.com/javase/8/docs/api/java/beans/PropertyChangeEvent.html)

for JMX Attributes there's already ... * [`javax.management.AttributeChangeNotification`](https://docs.oracle.com/javase/8/docs/api/javax/management/AttributeChangeNotification.html) * [`javax.management.AttributeChangeNotificationFilter`](https://docs.oracle.com/javase/8/docs/api/javax/management/AttributeChangeNotificationFilter.html) For a JMX Operation, that would just be a normal [`Notification`](https://docs.oracle.com/javase/8/docs/api/javax/management/Notification.html) and [`NotificationListener`](https://docs.oracle.com/javase/8/docs/api/javax/management/NotificationListener.html) Wouldn't it make more sense to ensure...

I just tried it, it would require each MBean that we care to listen to, to implement the `javax.management.NotificationBroadcaster`. These exist, but it's not like it's all that easy to...

What version of Jetty?

If you decide to do a pull request, make it against branch `jetty-10.0.x` only, we'll handle the merging to `jetty-11.0.x` and `jetty-12.0.x` ourselves.