Presence of <servlet-name> and <url-pattern> is not validated for <servlet-mapping> inside the web.xml

<?xml version="1.0"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
      version="3.0"> 
	<servlet>
		<servlet-name>MyServlet</servlet-name>
		<servlet-class&gt;servlets.MyServlet</servlet-class&gt;
                <load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>MyServlet</servlet-name>
		<!--url-pattern></url-pattern-->             <!-- NOTICE  url-pattern-tag is missing here -->
	</servlet-mapping>
</web-app>

15:50:20,207 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./ContextParamNullDemo.UndertowDeploymentInfoService: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./ContextParamNullDemo.UndertowDeploymentInfoService: Failed to start service
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1904) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_51]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_51]
	at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: java.lang.NullPointerException
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.handleServletMappings(UndertowDeploymentInfoService.java:910)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:656)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.start(UndertowDeploymentInfoService.java:252)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
	... 3 more

15:50:20,348 ERROR [org.jboss.as.controller.management-operation] (DeploymentScanner-threads - 1) WFLYCTL0013: Operation ("deploy") failed - address: ([("deployment" => "ContextParamNullDemo.war")]) - failure description: {"WFLYCTL0080: Failed services" => {"jboss.undertow.deployment.default-server.default-host./ContextParamNullDemo.UndertowDeploymentInfoService" => "org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./ContextParamNullDemo.UndertowDeploymentInfoService: Failed to start service
    Caused by: java.lang.NullPointerException"}}