While deploying 2 JSF application getting ConcurrentModificationException on NavigationHandlerImpl$NavigationMap$. App also uses seam 3.1.0. Please refer below stack trace.

11:57:21,898 INFO [javax.enterprise.resource.webcontainer.jsf.config] (MSC service thread 1-2) Initializing Mojarra 2.2.8-jbossorg-1 20140822-1131 for context '/com'
11:57:21,898 INFO [javax.enterprise.resource.webcontainer.jsf.config] (MSC service thread 1-6) Initializing Mojarra 2.2.8-jbossorg-1 20140822-1131 for context '/sof'
11:57:26,218 SEVERE [javax.enterprise.resource.webcontainer.jsf.config] (MSC service thread 1-2) Critical error during deployment: : com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:449) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:221) [jsf-impl-2.2.8-jbossorg-1.jar:]
at io.undertow.servlet.core.ApplicationListeners.contextInitialized(ApplicationListeners.java:173) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:193) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:87)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.start(UndertowDeploymentService.java:72)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_25]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_25]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) [rt.jar:1.8.0_25]
at java.util.HashMap$EntryIterator.next(HashMap.java:1463) [rt.jar:1.8.0_25]
at java.util.HashMap$EntryIterator.next(HashMap.java:1461) [rt.jar:1.8.0_25]
at com.sun.faces.application.NavigationHandlerImpl$NavigationMap$4$1.next(NavigationHandlerImpl.java:1523) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.application.NavigationHandlerImpl$NavigationMap$4$1.next(NavigationHandlerImpl.java:1511) [jsf-impl-2.2.8-jbossorg-1.jar:]
at java.util.AbstractMap.get(AbstractMap.java:185) [rt.jar:1.8.0_25]
at com.sun.faces.config.processor.NavigationConfigProcessor.addNavigationCasesForRule(NavigationConfigProcessor.java:323) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.NavigationConfigProcessor.addNavigationRules(NavigationConfigProcessor.java:224) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.NavigationConfigProcessor.process(NavigationConfigProcessor.java:167) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.RenderKitConfigProcessor.process(RenderKitConfigProcessor.java:196) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.ManagedBeanConfigProcessor.process(ManagedBeanConfigProcessor.java:270) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.ValidatorConfigProcessor.process(ValidatorConfigProcessor.java:120) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.ConverterConfigProcessor.process(ConverterConfigProcessor.java:126) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.ComponentConfigProcessor.process(ComponentConfigProcessor.java:117) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.ApplicationConfigProcessor.process(ApplicationConfigProcessor.java:344) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.LifecycleConfigProcessor.process(LifecycleConfigProcessor.java:116) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:239) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:435) [jsf-impl-2.2.8-jbossorg-1.jar:]
Caused by: java.lang.NullPointerException
at com.sun.faces.facelets.impl.DefaultResourceResolver.resolveUrl(DefaultResourceResolver.java:77) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.facelets.impl.DefaultFaceletFactory.init(DefaultFaceletFactory.java:170) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.application.ApplicationAssociate.createFaceletFactory(ApplicationAssociate.java:866) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.application.ApplicationAssociate.initializeFacelets(ApplicationAssociate.java:327) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.application.ApplicationAssociate.getCompiler(ApplicationAssociate.java:410) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:251) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:437) [jsf-impl-2.2.8-jbossorg-1.jar:]
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