Stanislav Mironov wrote:
<snip>
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)

What is the reason - bug in tomcat?

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


Steps to reproduce are here:
http://issues.apache.org/bugzilla/show_bug.cgi?id=37425
(JAR-locking related issue).
The issue was marked INVALID, but I see no excuses for Tomcat to throw
such meaningless exception without explanations what exactly has
happened.

I have followed your steps and do not see any error. Can you provide me with the smallest possible webapp that demonstrates this issue? Without this, there isn't much more I can do. You will need to mail it to me directly (or attach it to the bugzilla issue) as the mailing lists block most (all?) attachments.

Mark


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