Failed to determine servlet: java.lang.NullPointerException at org.jboss.as.web.deployment.JBossContextConfig.beforeLoadOnStartup

I'm migrating a WebSphere application to JBoss EAP 6.4. During deployment, I get the below error:

Failed to determine servlet: java.lang.NullPointerException

With this stack trace:

12:48:06,194 DEBUG [org.jboss.as.security] (MSC service thread 1-2) Qualified url patterns: {/=PatternInfo[pattern=/,type=3,isOverridden=false,qualifiers=[]]}
12:48:06,194 FINE  [javax.enterprise.resource.webcontainer.jsf.config] (ServerService Thread Pool -- 132) ConfigureListener.contextInitialized(/scWeb)
12:48:06,224 DEBUG [org.jboss.as.web.security] (ServerService Thread Pool -- 96) Failed to determine servlet: java.lang.NullPointerException
    at org.jboss.as.web.deployment.JBossContextConfig.beforeLoadOnStartup(JBossContextConfig.java:666) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:178) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
    at org.jboss.as.web.deployment.JBossContextConfig.lifecycleEvent(JBossContextConfig.java:260) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:115) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3592) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:3802) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
    at org.jboss.as.web.deployment.WebDeploymentService.doStart(WebDeploymentService.java:163) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
    at org.jboss.as.web.deployment.WebDeploymentService.access$000(WebDeploymentService.java:61) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
    at org.jboss.as.web.deployment.WebDeploymentService$1.run(WebDeploymentService.java:96) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [rt.jar:1.8.0_45]
    at java.util.concurrent.FutureTask.run(Unknown Source) [rt.jar:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [rt.jar:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [rt.jar:1.8.0_45]
    at java.lang.Thread.run(Unknown Source) [rt.jar:1.8.0_45]
    at org.jboss.threads.JBossThread.run(JBossThread.java:122)

12:48:43,934 DEBUG [org.jboss.ejb.client.txn] (Periodic Recovery) Send recover request for transaction origin node identifier 1 to EJB receiver with node name inbaghpc00516
12:52:40,593 ERROR [org.jboss.as.controller.management-operation] (HttpManagementService-threads - 1) JBAS013412: Timeout after [300] seconds waiting for service container stability. Operation will roll back. Step that first updated the service container was 'deploy' at address '[("deployment" => "PCB-5.3.ear")]'

How is this caused and how can I solve it?