My Vaadin app was working just fine but then I tried to update Jetty from 12.1.8 to 12.1.9
There is a FileSystemPool related change in Jetty changelog.
5803 [qtp623832272-95] WARN org.eclipse.jetty.ee11.servlet.ServletChannel - /contextpath/lumo/lumo.css
java.nio.file.FileSystemNotFoundException
at jdk.zipfs/jdk.nio.zipfs.ZipFileSystemProvider.getFileSystem(ZipFileSystemProvider.java:153)
at jdk.zipfs/jdk.nio.zipfs.ZipFileSystemProvider.getPath(ZipFileSystemProvider.java:139)
at java.base/java.nio.file.Path.of(Path.java:206)
at com.vaadin.flow.server.VaadinServletService.getStaticResource(VaadinServletService.java:344)
at com.vaadin.flow.server.VaadinServletService.getStaticResource(VaadinServletService.java:259)
at com.vaadin.flow.server.StaticFileServer.getStaticResource(StaticFileServer.java:467)
at com.vaadin.flow.server.StaticFileServer.serveStaticResource(StaticFileServer.java:351)
at com.vaadin.flow.server.VaadinServlet.serveStaticOrWebJarRequest(VaadinServlet.java:433)
at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:389)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.eclipse.jetty.ee11.servlet.ServletHolder.handle(ServletHolder.java:754)
at org.eclipse.jetty.ee11.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1668)
at org.eclipse.jetty.ee11.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:199)
at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
at org.eclipse.jetty.ee11.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1602)
at org.eclipse.jetty.ee11.servlet.ServletChannel.dispatch(ServletChannel.java:871)
at org.eclipse.jetty.ee11.servlet.ServletChannel.handle(ServletChannel.java:449)
at org.eclipse.jetty.ee11.servlet.ServletHandler.handle(ServletHandler.java:469)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:546)
at org.eclipse.jetty.ee11.servlet.SessionHandler.handle(SessionHandler.java:763)
at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1250)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:178)
at org.eclipse.jetty.server.Server.handle(Server.java:197)
at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:793)
at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:419)
at org.eclipse.jetty.server.internal.HttpConnection$FillableCallback.succeeded(HttpConnection.java:1780)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:54)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:492)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.epcRunTask(AdaptiveExecutionStrategy.java:428)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:401)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:255)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:204)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:317)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:1009)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1240)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1194)
at java.base/java.lang.Thread.run(Thread.java:1474)
Same problem in skeleton-starter-flow when switching to 12.1.9
[WARNING] /lumo/lumo.css
java.nio.file.FileSystemNotFoundException
at jdk.nio.zipfs.ZipFileSystemProvider.getFileSystem (ZipFileSystemProvider.java:153)
at jdk.nio.zipfs.ZipFileSystemProvider.getPath (ZipFileSystemProvider.java:139)
at java.nio.file.Path.of (Path.java:206)
at com.vaadin.flow.server.VaadinServletService.getStaticResource (VaadinServletService.java:344)
at com.vaadin.flow.server.VaadinServletService.getStaticResource (VaadinServletService.java:259)
at com.vaadin.flow.server.StaticFileServer.getStaticResource (StaticFileServer.java:467)
at com.vaadin.flow.server.StaticFileServer.serveStaticResource (StaticFileServer.java:351)
at com.vaadin.flow.server.VaadinServlet.serveStaticOrWebJarRequest (VaadinServlet.java:433)
at com.vaadin.flow.server.VaadinServlet.service (VaadinServlet.java:389)
at jakarta.servlet.http.HttpServlet.service (HttpServlet.java:614)
at org.eclipse.jetty.ee10.servlet.ServletHolder.handle (ServletHolder.java:754)
at org.eclipse.jetty.ee10.servlet.ServletHandler$ChainEnd.doFilter (ServletHandler.java:1622)
at org.eclipse.jetty.ee10.websocket.servlet.WebSocketUpgradeFilter.doFilter (WebSocketUpgradeFilter.java:199)
at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter (FilterHolder.java:205)
at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter (ServletHandler.java:1594)
at org.eclipse.jetty.ee10.servlet.ServletHandler$MappedServlet.handle (ServletHandler.java:1556)
at org.eclipse.jetty.ee10.servlet.ServletChannel.dispatch (ServletChannel.java:871)
at org.eclipse.jetty.ee10.servlet.ServletChannel.handle (ServletChannel.java:449)
at org.eclipse.jetty.ee10.servlet.ServletHandler.handle (ServletHandler.java:469)
at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:546)
at org.eclipse.jetty.ee10.servlet.SessionHandler.handle (SessionHandler.java:719)
at org.eclipse.jetty.server.handler.ContextHandler.handle (ContextHandler.java:1250)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:148)
at org.eclipse.jetty.server.Server.handle (Server.java:197)
at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run (HttpChannelState.java:793)
at org.eclipse.jetty.server.internal.HttpConnection.onFillable (HttpConnection.java:419)
at org.eclipse.jetty.server.internal.HttpConnection$FillableCallback.succeeded (HttpConnection.java:1780)
at org.eclipse.jetty.io.FillInterest.fillable (FillInterest.java:105)
at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run (SelectableChannelEndPoint.java:54)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask (AdaptiveExecutionStrategy.java:492)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.epcRunTask (AdaptiveExecutionStrategy.java:428)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask (AdaptiveExecutionStrategy.java:401)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce (AdaptiveExecutionStrategy.java:255)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.produce (AdaptiveExecutionStrategy.java:196)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:1009)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob (QueuedThreadPool.java:1240)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run (QueuedThreadPool.java:1194)
at java.lang.Thread.run (Thread.java:1474)