jperkins@localhost ~/projects/jboss/examples/javaee/simple-servlet (master *+) $ mvn wildfly:execute-commands
[INFO] Scanning for projects...
[INFO] 
[INFO] --------------< org.jboss.examples.javaee:simple-servlet >--------------
[INFO] Building simple-servlet 1.0.0-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO] 
[INFO] --- wildfly-maven-plugin:1.3.0.Alpha1-SNAPSHOT:execute-commands (default-cli) @ simple-servlet ---
[INFO] JBoss Threads version 2.3.2.Final
WARN: can't find jboss-cli.xml. Using default configuration values.
[INFO] XNIO version 3.6.5.Final
[INFO] XNIO NIO Implementation Version 3.6.5.Final
[INFO] JBoss Remoting version 5.0.8.Final
[INFO] ELY00001: WildFly Elytron version 1.6.0.Final
[INFO] Warning! The CLI is running in a non-modular environment and cannot load commands from management extensions.
Warning! The CLI is running in a non-modular environment and cannot load commands from management extensions.
[INFO] {
    "outcome" => "success",
    "result" => "STANDALONE"
}
{
    "outcome" => "success",
    "result" => "STANDALONE"
}
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.696 s
[INFO] Finished at: 2018-10-11T16:22:15-07:00
[INFO] ------------------------------------------------------------------------
[ERROR] Close handler threw an exception
java.lang.NoClassDefFoundError: org/xnio/XnioWorker$ExternalTaskPool
    at org.xnio.XnioWorker.isTaskPoolExternal (XnioWorker.java:824)
    at org.xnio.XnioWorker.shutDownTaskPool (XnioWorker.java:791)
    at org.xnio.nio.NioXnioWorker.shutdown (NioXnioWorker.java:284)
    at org.jboss.remoting3.EndpointImpl.finishPhase1 (EndpointImpl.java:348)
    at org.jboss.remoting3.EndpointImpl.closeTick1 (EndpointImpl.java:331)
    at org.jboss.remoting3.EndpointImpl.lambda$addConnectionProvider$8 (EndpointImpl.java:688)
    at org.jboss.remoting3.spi.SpiUtils.safeHandleClose (SpiUtils.java:50)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable$CloseHandlerTask.run (AbstractHandleableCloseable.java:520)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.runCloseTask (AbstractHandleableCloseable.java:425)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeComplete (AbstractHandleableCloseable.java:286)
    at org.jboss.remoting3.remote.RemoteConnectionProvider.closeAction (RemoteConnectionProvider.java:303)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync (AbstractHandleableCloseable.java:368)
    at org.jboss.remoting3.EndpointImpl.closeAction (EndpointImpl.java:400)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.close (AbstractHandleableCloseable.java:150)
    at org.jboss.as.cli.impl.CLIModelControllerClient$1.shutdown (CLIModelControllerClient.java:92)
    at org.jboss.as.cli.impl.CliShutdownHook$1.run (CliShutdownHook.java:50)
    at java.lang.Thread.run (Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.xnio.XnioWorker$ExternalTaskPool
    at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass (SelfFirstStrategy.java:50)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass (ClassRealm.java:271)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass (ClassRealm.java:247)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass (ClassRealm.java:239)
    at org.xnio.XnioWorker.isTaskPoolExternal (XnioWorker.java:824)
    at org.xnio.XnioWorker.shutDownTaskPool (XnioWorker.java:791)
    at org.xnio.nio.NioXnioWorker.shutdown (NioXnioWorker.java:284)
    at org.jboss.remoting3.EndpointImpl.finishPhase1 (EndpointImpl.java:348)
    at org.jboss.remoting3.EndpointImpl.closeTick1 (EndpointImpl.java:331)
    at org.jboss.remoting3.EndpointImpl.lambda$addConnectionProvider$8 (EndpointImpl.java:688)
    at org.jboss.remoting3.spi.SpiUtils.safeHandleClose (SpiUtils.java:50)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable$CloseHandlerTask.run (AbstractHandleableCloseable.java:520)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.runCloseTask (AbstractHandleableCloseable.java:425)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeComplete (AbstractHandleableCloseable.java:286)
    at org.jboss.remoting3.remote.RemoteConnectionProvider.closeAction (RemoteConnectionProvider.java:303)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync (AbstractHandleableCloseable.java:368)
    at org.jboss.remoting3.EndpointImpl.closeAction (EndpointImpl.java:400)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.close (AbstractHandleableCloseable.java:150)
    at org.jboss.as.cli.impl.CLIModelControllerClient$1.shutdown (CLIModelControllerClient.java:92)
    at org.jboss.as.cli.impl.CliShutdownHook$1.run (CliShutdownHook.java:50)
    at java.lang.Thread.run (Thread.java:748)