救命阿，tomcat下网站过一段时间就挂一次，找不出原因。。。

[duwucna]

Tomcat+IIS6,Win2003运行一段时间，我用了proxool . 网站就down掉

tocmat log中发现的错误一：

2006-8-20 21:47:41 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:367)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:286)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:974)


tocmat log中发现的错误二：
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
严重: Exception invoking periodic operation:
java.lang.NullPointerException
at org.apache.naming.resources.ResourceCache.find(ResourceCache.java:383)
at org.apache.naming.resources.ResourceCache.lookup(ResourceCache.java:317)
at org.apache.naming.resources.ProxyDirContext.cacheLookup(ProxyDirContext.java:1443)
at org.apache.naming.resources.ProxyDirContext.getAttributes(ProxyDirContext.java:868)
at org.apache.catalina.startup.HostConfig.checkContextLastModified(HostConfig.java:695)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:979)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:377)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.StandardHost.backgroundProcess(StandardHost.java:806)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1654)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1663)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1643)
at java.lang.Thread.run(Unknown Source)

[duwucna]

打开网站就出现：
java.lang.NullPointerException
at org.apache.naming.resources.ResourceCache.find(ResourceCache.java:373)
at org.apache.naming.resources.ResourceCache.lookup(ResourceCache.java:317)
at org.apache.naming.resources.ProxyDirContext.cacheLookup(ProxyDirContext.java:1443)
at org.apache.naming.resources.ProxyDirContext.lookup(ProxyDirContext.java:329)