JSF application without CDI causes Undertow to crash on deployment ------------------------------------------------------------------ Key: WFLY-4889 URL: https://issues.jboss.org/browse/WFLY-4889 Project: WildFly Issue Type: Bug Components: JSF Affects Versions: 9.0.0.Final Reporter: Ken Finnigan Assignee: Farah Juma My understanding of the JSF spec is that CDI is not a requirement for JSF to function, though there may be some parts of CDI that are required. If I deploy a very simple JSF app to Undertow without CDI, I get the following stack trace: {noformat} Caused by: java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) at java.util.concurrent.ConcurrentHashMap.putAll(ConcurrentHashMap.java:1084) at io.undertow.servlet.spec.ServletContextImpl.<init>(ServletContextImpl.java:128) at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:148) at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:100) at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:82) ... 6 more {noformat} From debugging the value being {{put}} that causes the NPE, it is attempting to add a value of {{null}} for the key {{javax.faces.validator.beanValidator.ValidatorFactory}}. I believe this is a result of https://github.com/wildfly/wildfly/blob/master/jsf/subsystem/src/main/jav... adding the validation factory as a servlet context attribute whether the retrieval found one or not.