Tomcat部署项目时出现异常导致404错误

Question

部署好项目后，启动tomcat，访问项目的某个servlet，出现了404错误，路径没写错，web.xml里面也没找到什么问题，查看控制台，发现如下信息，
.
.
.

严重: ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/webday13_session]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
.
.
.
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
Caused by: java.lang.IllegalArgumentException: Invalid logout in servlet mapping
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3155)
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3130)
.
.
.
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:148)
... 29 more
2011-8-27 21:48:01 org.apache.catalina.startup.HostConfig deployDirectory
严重: Error deploying web application directory webday13_session
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/webday13_session]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:816)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
. at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)

各位大侠，是哪里出了问题呢？

Answer 1

[quote]问题补充：
freish 写道
Caused by: java.lang.IllegalArgumentException: Invalid logout in servlet mapping

CountServlet
/count


LogoutServlet
/logout

logout的url-pattern前面记得加/，我看你后面把count前面的/又去掉了，都加上

加上了，还是404错误。。。[/quote]

把错误信息再贴一下