I have encountering following error when I deply PRPC7.2.1 (prweb.war) on Oracle DB Proprietary information hidden.0 / Weblogic Proprietary information hidden.0/Centos7.2

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Sep 27, 2016 8:35:39 AM com.pega.pegarules.internal.bootstrap.PRBootstrap
SEVERE: Unable to retrieve method
java.lang.NoSuchMethodException: com.pega.pegarules.web.servlet.WebAppLifeCycleListener.contextInitialized(javax.servlet.ServletContextEvent)
        at java.lang.Class.getMethod(Class.java:1786)
        at com.pega.pegarules.internal.bootstrap.PRBootstrap.getMethod(PRBootstrap.java:292)
        at com.pega.pegarules.internal.bootstrap.PRBootstrap.getEntry(PRBootstrap.java:334)
        at com.pega.pegarules.internal.bootstrap.PRBootstrap.getMethod(PRBootstrap.java:304)
        at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:409)
        at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
        at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273)
        at com.pega.pegarules.internal.web.servlet.WebAppLifeCycleListenerBoot.contextInitialized(WebAppLifeCycleListenerBoot.java:83)
        at weblogic.servlet.internal.EventsManager$FireContextListenerAction.run(EventsManager.java:705)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326)
        at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:197)
        at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203)
        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71)
        at weblogic.servlet.internal.EventsManager.executeContextListener(EventsManager.java:251)
        at weblogic.servlet.internal.EventsManager.notifyContextCreatedEvent(EventsManager.java:204)
        at weblogic.servlet.internal.EventsManager.notifyContextCreatedEvent(EventsManager.java:189)
        at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1911)
        at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3091)
        at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1849)
        at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:882)
        at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:360)
        at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:356)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
        at weblogic.application.internal.ExtensibleModuleWrapper.start(ExtensibleModuleWrapper.java:138)
        at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:124)
        at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:233)
        at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:228)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
        at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:78)
        at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:52)
        at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:754)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
        at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:264)
        at weblogic.application.internal.SingleModuleDeployment.activate(SingleModuleDeployment.java:52)
        at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:165)
        at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:90)
        at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:265)
        at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:481)
        at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:53)
        at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:202)
        at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:52)
        at weblogic.management.deploy.internal.ConfiguredDeployments$2.doItem(ConfiguredDeployments.java:684)
        at weblogic.management.deploy.internal.parallel.BucketInvoker.invoke(BucketInvoker.java:109)
        at weblogic.management.deploy.internal.ConfiguredDeployments.transitionAppsParallel(ConfiguredDeployments.java:692)
        at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:341)
        at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:203)
        at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:207)
        at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:129)
        at weblogic.server.AbstractServerService.postConstruct(AbstractServerService.java:76)
        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.glassfish.hk2.utilities.reflection.ReflectionHelper.invoke(ReflectionHelper.java:1262)
        at org.jvnet.hk2.internal.ClazzCreator.postConstructMe(ClazzCreator.java:332)
        at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:374)
        at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
        at org.glassfish.hk2.runlevel.internal.AsyncRunLevelContext.findOrCreate(AsyncRunLevelContext.java:232)
        at org.glassfish.hk2.runlevel.RunLevelContext.findOrCreate(RunLevelContext.java:85)
        at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
        at org.jvnet.hk2.internal.ServiceHandleImpl.getService(ServiceHandleImpl.java:114)
        at org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:693)
        at org.jvnet.hk2.internal.ThreeThirtyResolver.resolve(ThreeThirtyResolver.java:78)
        at org.jvnet.hk2.internal.ClazzCreator.resolve(ClazzCreator.java:211)
        at org.jvnet.hk2.internal.ClazzCreator.resolveAllDependencies(ClazzCreator.java:234)
        at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:357)
        at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
        at org.glassfish.hk2.runlevel.internal.AsyncRunLevelContext.findOrCreate(AsyncRunLevelContext.java:232)
        at org.glassfish.hk2.runlevel.RunLevelContext.findOrCreate(RunLevelContext.java:85)
        at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
        at org.jvnet.hk2.internal.ServiceHandleImpl.getService(ServiceHandleImpl.java:114)
        at org.jvnet.hk2.internal.ServiceHandleImpl.getService(ServiceHandleImpl.java:88)
        at org.glassfish.hk2.runlevel.internal.CurrentTaskFuture$QueueRunner.oneJob(CurrentTaskFuture.java:1213)
        at org.glassfish.hk2.runlevel.internal.CurrentTaskFuture$QueueRunner.run(CurrentTaskFuture.java:1144)
        at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:666)
        at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:348)
        at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:333)
        at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:54)
        at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
        at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:640)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:406)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:346)

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NOTE:

- I was referred manual https://docs.pega.com/pega-721-platform-installation-guide-oracle-weblogic-server-and-oracle 

- Data source test has passed by Weblogic Console Tool.

- prhelp.war and prsysmgmt.war has succeed.

***Updated by Moderator: Vidyaranjan. Removed user added FAQ tag. Apologies for confusion, shouldn't have been an end-user option***