Isn't that the same error that happens only on your mac also in few other cases? Can you try on any other platform? Sent from my Phone ------------------------------ From: Ales Justin <ales.justin(a)gmail.com&gt; Sent: ‎27.‎12.‎2013 14:14 To: Wildfly Dev mailing list <wildfly-dev(a)lists.jboss.org&gt; Subject: [wildfly-dev] xnio selection err While using UnderTow's JSR WebSockets, implementing simple chat app, between 2 diff browsers (Chrome and Safari), I get a flood of these log lines: 14:09:22,890 WARN [org.xnio.nio.selector] (default I/O-3) XNIO008000: Received an I/O error on selection: java.io.IOException: Invalid argument Any idea? -Ales