Intermittent test failures in Healthcheck tests and StaticHandlerTest

[tsegismont]

For example:

2023-12-15T05:05:23.1433709Z Tests run: 12, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.094 sec <<< FAILURE! - in io.vertx.ext.web.healthchecks.AuthenticationTest
2023-12-15T05:05:23.1437153Z testAuthenticationSuccessfulUsingBody(io.vertx.ext.web.healthchecks.AuthenticationTest)  Time elapsed: 0.016 sec  <<< ERROR!
2023-12-15T05:05:23.1439302Z io.vertx.core.impl.NoStackTraceThrowable: Pool closed

2023-12-20T05:03:03.9789358Z Tests run: 8, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.095 sec <<< FAILURE! - in io.vertx.ext.web.healthchecks.HealthCheckWithSubRouterWithoutRouteTest
2023-12-20T05:03:03.9792576Z testWithExplicitSuccessfulCheck(io.vertx.ext.web.healthchecks.HealthCheckWithSubRouterWithoutRouteTest)  Time elapsed: 0.01 sec  <<< ERROR!
2023-12-20T05:03:03.9794448Z io.vertx.core.impl.NoStackTraceThrowable: Pool closed

2023-12-21T05:05:47.4666194Z Starting test: StaticHandlerTest#testWithClassLoader 
2023-12-21T05:05:47.4713499Z io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: localhost/127.0.0.1:8080
2023-12-21T05:05:47.4715548Z Caused by: java.net.ConnectException: Connection refused
2023-12-21T05:05:47.4717123Z 	at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
2023-12-21T05:05:47.4718845Z 	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:777)
2023-12-21T05:05:47.4720572Z 	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337)
2023-12-21T05:05:47.4722379Z 	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:335)
2023-12-21T05:05:47.4724474Z 	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
2023-12-21T05:05:47.4726077Z 	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
2023-12-21T05:05:47.4727816Z 	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
2023-12-21T05:05:47.4729212Z 	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
2023-12-21T05:05:47.4730637Z 	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
2023-12-21T05:05:47.4732348Z 	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
2023-12-21T05:05:47.4733946Z 	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
2023-12-21T05:05:47.4735208Z 	at java.base/java.lang.Thread.run(Thread.java:829)
2

[tsegismont]

This seems to be in main branch only (Vert.x 5). It happens with any of the JDK or OS version.

[tsegismont]

cc @vietj (in case that rings a bell)