Red Hat Certificate System CA subsystem start exception on PassThroughRequestFilter after upgrading from 8.0 to 8.1

Solution Verified - Updated -

Issue

After updating Red Hat Certificate System from version 8.0 to version 8.1, the CA subsystem will no longer start.
Additionally, the following error is displayed in the Tomcat log file (catalina.out):

SEVERE: Exception starting filter PassThroughRequestFilter
java.lang.ClassNotFoundException: com.netscape.cms.servlet.filter.PassThroughRequestFilter
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1374)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1220)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:207)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4218)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:975)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:938)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1193)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:448)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

Environment

Red Hat Enterprise Linux 5
Red Hat Certificate System 8.1 (updated from version 8.0)

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