When I start running my java application through Tomcat server, I encountered this kind of error. What should I do?

Question

Tomcat authentication filter error.

Dec 07, 2017 11:15:51 AM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter AuthenticationFilter
java.lang.ClassNotFoundException: gov.da.jmrs.webapp.filters.AuthenticationFilter
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1339)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:509)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:490)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
    at 

org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4700) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5340) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

Answer 1

Check your classpath, missing class to the classptah. Read this topic to know more How do I resolve ClassNotFoundException?