Consider switching to Apache Commons IO Monitor instead of using the NIO2 WatchService

[kristian]

Currently using the NIO2 WatchService in Java turned out to be a huge pain, due to the JVM internal implementation approach. We never achieved to have a consistent behaviour across all operating systems, which e.g. led to us having to disable all WatchVerticle related tests in our containerized build on GitHub (see [1] explaining why).

After consultation with @gedack he raised the idea of switching to Apache Commons IO Monitor as an alternative to use WatchService. It shall be clarified in a PoC whether that is a more viable approach.

[1] https://blog.arkey.fr/2019/09/13/watchservice-and-bind-mount/

[kristian]

Further reading [1]

[1] https://www.baeldung.com/java-watchservice-vs-apache-commons-io-monitor-library

[s4heid]

The WatchService is biting us again, when building a dockerimage on M1 chips.

16:15:41.253 [vert.x-eventloop-thread-0] {noCorrelationIdAvailable} ERROR io.neonbee.internal.deploy.PendingDeployment - Deployment of Verticle(io.neonbee.internal.verticle.ModelRefreshVerticle) failed
java.io.IOException: Function not implemented
	at java.base/sun.nio.fs.LinuxWatchService.<init>(LinuxWatchService.java:64)
	at java.base/sun.nio.fs.LinuxFileSystem.newWatchService(LinuxFileSystem.java:47)
	at io.neonbee.internal.verticle.WatchVerticle.start(WatchVerticle.java:167)
	at io.vertx.core.impl.DeploymentManager.lambda$doDeploy$5(DeploymentManager.java:196)
	at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:264)
	at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:246)
	at io.vertx.core.impl.EventLoopContext.lambda$runOnContext$0(EventLoopContext.java:43)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:829)

Related: docker/for-mac#6174