java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "this.threadSetupActions" is null

Issue

• When we try to deploy a war with a Websockets that has a EndpointConfig parameter, encounter below error:

ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 98) MSC000001: Failed to start service jboss.deployment.unit."ROOT.war".undertow-deployment: org.jboss.msc.service.StartException in ser
vice jboss.deployment.unit."ROOT.war".undertow-deployment: java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "this.threadSetupActions" is null
        at org.wildfly.extension.undertow@8.0.0.GA-redhat-00011//org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.
java:90)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
        at java.base/java.lang.Thread.run(Thread.java:833)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.JBossThread.run(JBossThread.java:513)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "this.threadSetupActions" is null
        at io.undertow.servlet@2.3.10.SP3-redhat-00001//io.undertow.servlet.core.DeploymentManagerImpl.undeploy(DeploymentManagerImpl.java:690)
        at org.wildfly.extension.undertow@8.0.0.GA-redhat-00011//org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:110)
        at org.wildfly.extension.undertow@8.0.0.GA-redhat-00011//org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:87)
        ... 8 more
Caused by: java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "this.threadSetupActions" is null
        at io.undertow.servlet@2.3.10.SP3-redhat-00001//io.undertow.servlet.core.DeploymentImpl.createThreadSetupAction(DeploymentImpl.java:176)
        at io.undertow.servlet@2.3.10.SP3-redhat-00001//io.undertow.servlet.core.DeploymentManagerImpl.undeploy(DeploymentManagerImpl.java:673)
        ... 10 more

12:01:03,644 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("deploy") failed - address: ([("deployment" => ROOT.war")]) - failure description: {"WFLYCTL0080: 
Failed services" => {"jboss.deployment.unit.\"ROOT.war\".undertow-deployment" => "java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke \"java.util.List.iterator()\" because \"this.threadSetupAc
tions\" is null
    Caused by: java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke \"java.util.List.iterator()\" because \"this.threadSetupActions\" is null
    Caused by: java.lang.NullPointerException: Cannot invoke \"java.util.List.iterator()\" because \"this.threadSetupActions\" is null"}}