Add configuration to disable systematic file watch in ServletResourceManager ---------------------------------------------------------------------------- Key: WFLY-6251 URL: https://issues.jboss.org/browse/WFLY-6251 Project: WildFly Issue Type: Feature Request Components: Web (Undertow) Affects Versions: 10.0.0.Final Environment: Oracle JDK 8u74 on CentOs Reporter: Mathieu Lachance Assignee: Stuart Douglas Our application is deployed multiple time in production as an exploded war. Eventually we are running into "User limit of inotify watches reached": {code} ERROR [io.undertow] (MSC service thread 1-6) UT005024: Could not register resource change listener for caching resource manager, automatic invalidation of cached resource will not work: java.lang.RuntimeException: java.io.IOException: User limit of inotify watches reached at org.xnio.nio.WatchServiceFileSystemWatcher.watchPath(WatchServiceFileSystemWatcher.java:179) at io.undertow.server.handlers.resource.FileResourceManager.registerResourceChangeListener(FileResourceManager.java:161) [undertow-core-1.1.0.Final.jar:1.1.0.Final] at org.wildfly.extension.undertow.deployment.ServletResourceManager.registerResourceChangeListener(ServletResourceManager.java:80) at io.undertow.server.handlers.resource.CachingResourceManager.<init>(CachingResourceManager.java:64) [undertow-core-1.1.0.Final.jar:1.1.0.Final] at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:525) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.start(UndertowDeploymentInfoService.java:256) at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_45] at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_45] Caused by: java.io.IOException: User limit of inotify watches reached at sun.nio.fs.LinuxWatchService$Poller.implRegister(LinuxWatchService.java:264) [rt.jar:1.8.0_45] at sun.nio.fs.AbstractPoller.processRequests(AbstractPoller.java:260) [rt.jar:1.8.0_45] at sun.nio.fs.LinuxWatchService$Poller.run(LinuxWatchService.java:329) [rt.jar:1.8.0_45] ... 1 more {code} From what I'm seeing in: https://github.com/wildfly/wildfly/blob/master/undertow/src/main/java/org... https://github.com/undertow-io/undertow/blob/master/core/src/main/java/io... https://github.com/undertow-io/undertow/blob/master/core/src/main/java/io... there's no way to disable the file resource watch at the sole exception of using non-exploded war deployment. We will eventually switch to a non-exploded war but I think having a configuration (either within the standalone.xml or via system property) to completly turn off that feature would be a nice addition / improvement. In the meanwhile, as a workaround we have increased the inotify watch on the OS and will most likely patch either undertow and/or wildfly-undertow to not add any watch at all. Thanks