NPE for all requests on Linux host ---------------------------------- Key: WFLY-4437 URL: https://issues.jboss.org/browse/WFLY-4437 Project: WildFly Issue Type: Bug Components: Web (Undertow) Reporter: Nicklas Karlsson Assignee: Stuart Douglas I have a WF9 upstream master from a few week back running in standalone mode on a CentOS 5.2 Final with a 64bit 1.8.0_25b17 JDK. However, every request returns a 500 because of the NPE below. The startup/deployment is normal with no errors in the log {code} 2015-03-03 10:56:39,790 ERROR [io.undertow.request] (default I/O-1) Undertow request failed HttpServerExchange{ GET /}: java.lang.NullPointerException at io.undertow.server.handlers.SetHeaderHandler.handleRequest(SetHeaderHandler.java:57) at io.undertow.server.handlers.NameVirtualHostHandler.handleRequest(NameVirtualHostHandler.java:53) at io.undertow.server.handlers.error.SimpleErrorPageHandler.handleRequest(SimpleErrorPageHandler.java:76) at io.undertow.server.handlers.CanonicalPathHandler.handleRequest(CanonicalPathHandler.java:49) at io.undertow.server.handlers.ChannelUpgradeHandler.handleRequest(ChannelUpgradeHandler.java:158) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199) at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:189) at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:113) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:143) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:90) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:49) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:291) at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.nio.NioTcpServerHandle.handleReady(NioTcpServerHandle.java:53) at org.xnio.nio.WorkerThread.run(WorkerThread.java:539) {code} A WF 8.1.0 runs fine on the host and the same WF9 have run on other Linux hosts but I'm unable to pin down what affects Undertow in this way.