NoClassDefFoundErrors for javax.servlet classes seen moving to EAP 8

Issue

• Deploying our app to EAP 8, we see the NoClassDefFoundErrors like below complaining that classes from the javax.servlet package are not found:

WARN  [org.jboss.modules.define] (MSC service thread 1-2) Failed to define class com.app.MyServlet in Module "deployment.app.war" from Service Module Loader: java.lang.NoClassDefFoundError: Failed to link com/app/MyServlet (Module "deployment.app.war" from Service Module Loader): javax/servlet/http/HttpServlet
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1022)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1101)
        at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:351)
        at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:482)
        at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:276)
        at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:79)
        at org.jboss.modules.Module.loadModuleClass(Module.java:765)
        at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:192)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:410)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
        at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Class.java:398)
        at org.jboss.as.ee@8.0.0.GA-redhat-00011//org.jboss.as.ee.utils.ClassLoadingUtils.loadClass(ClassLoadingUtils.java:21)
        at org.jboss.as.ee@8.0.0.GA-redhat-00011//org.jboss.as.ee.utils.ClassLoadingUtils.loadClass(ClassLoadingUtils.java:14)
        at org.jboss.as.ee@8.0.0.GA-redhat-00011//org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:84)
        at org.jboss.as.ee@8.0.0.GA-redhat-00011//org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.deploy(InterceptorAnnotationProcessor.java:77)
        at org.jboss.as.server@21.0.5.Final-redhat-00001//org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:182)
        at org.jboss.msc@1.5.1.Final-redhat-00001//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1617)
        at org.jboss.msc@1.5.1.Final-redhat-00001//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1580)
        at org.jboss.msc@1.5.1.Final-redhat-00001//org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1438)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
        at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
        at java.base/java.lang.Thread.run(Thread.java:829)