Stanislav Mironov wrote:
Hi All!

I get such exception report in catalina.xxxx.log when I undeploy web
application (deployed as WAR).

09.11.2005 10:46:59 org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/context1]
09.11.2005 10:47:12 org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/context1]

Looks like two overlapping attempts to undeploy the same context. Not surprising that this results in an NPE at some point.

09.11.2005 10:47:12
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor
processChildren
SEVERE: Exception invoking periodic operation:
java.lang.NullPointerException
        at 
org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:883)
        at 
org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1019)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1178)
        at 
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:292)
        at 
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at 
org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1304)
        at 
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1568)
        at 
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1577)
        at 
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1557)
        at java.lang.Thread.run(Unknown Source)

What is the reason - bug in tomcat?

Maybe, maybe not. What are the steps to reproduce?

Mark


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