NPE in ServletContextImpl after session timed out

 * create deployment with session servlet  * deploy and start  * create another deployment with session servlet and broken session manager factory  * deploy, which will fail, ignore the exception    (this is Wildfly behaviour when deploying an EAR containing multiple WARs)  * send a request to first session servlet (this will create a new session)    Undertow responds with HTTP 200  * wait until session expires  * send another request to the first session servlet    Undertow responds with HTTP 500 The following stacktrace shows up in the log ERROR (XNIO-1 task-2) [io.undertow.request] <LoggingExceptionHandler.java:80> UT005023: Exception handling request to /1/servlet: java.lang.NullPointerException: Cannot invoke "io.undertow.server.session.SessionManager.getSession( String )" because the return value of "io.undertow.servlet.api.Deployment.getSessionManager()" is null at io.undertow.servlet.spec.ServletContextImpl.getSession(ServletContextImpl.java:937) at io.undertow.servlet.spec.HttpServletRequestImpl.getSession(HttpServletRequestImpl.java:443) at io.undertow.servlet.spec.HttpServletRequestImpl.getSession(HttpServletRequestImpl.java:448) at io.undertow.servlet.test.session.SessionServlet.doGet(SessionServlet.java:37) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:527) ...