When start tomcat, got the error: Resource /WEB-INF/classes not found

javax.naming.NameNotFoundException: Resource /WEB-INF/classes not found
at org.apache.naming.resources.BaseDirContext.listBindings(BaseDirContext.java:733)
at org.apache.naming.resources.ProxyDirContext.listBindings(ProxyDirContext.java:546)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1197)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:825)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:300)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:897)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:873)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1095)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1617)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at java.lang.Thread.run(Thread.java:619)

After searched online, it says it's a bug of tomcat. But it wouldn't affect the function of tomcat, go ahead to deploy your applications. Here is the link explains details.

http://stackoverflow.com/questions/9260555/tomcat-7-in-eclipse-indigo

This is actually a bug in Tomcat 7.0.25 and fixed in Tomcat 7.0.26. See also issue 52511. Please note that you can just continue using your web application! This log is purely informal and does not block Tomcat from starting and functioning. It's caused by a change in the way how Tomcat scans annotated classes. This stacktrace will be printed when you don't have any classes in your Eclipse project and hence the /WEB-INF/classes remains empty.

Upgrading to Tomcat 7.0.26 will hide this log. You can also just ignore it altogether and continue using Tomcat as usual.

As per the comments,

i Installed Eclipse for Java EE, in that in the server tab i added the server , when i run the server and try to open the localhost:8080 in the browser, it did not give me the welcome page, therefore i added the plugin in the eclipse plugins, now it gives me the welcome page in browser but adding to that it gives above error in console.