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From "Claus Ibsen (JIRA)" <>
Subject [jira] [Commented] (AMQ-4008) Tomcat WARN on shutdown about ThreadLocal not cleared from log4j
Date Fri, 31 Aug 2012 08:47:08 GMT


Claus Ibsen commented on AMQ-4008:

After digging for a while, its due to MDC being inherited by child threads, eg Log4j code
ThreadLocalMap extends InheritableThreadLocal

We don't have a way to control this, the issue is JMX that does all kind of crap causing MDC
leaks, as we cannot tell the **** to not inheirt, or to clear the MDC when threads is terminated.
> Tomcat WARN on shutdown about ThreadLocal not cleared from log4j
> ----------------------------------------------------------------
>                 Key: AMQ-4008
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 5.6.0
>            Reporter: Claus Ibsen
>            Assignee: Claus Ibsen
>            Priority: Minor
>             Fix For: 5.7.0
> SEVERE: The web application [/camel-example-activemq-tomcat] created a ThreadLocal with
key of type [org.apache.log4j.helpers.ThreadLocalMap] (value [org.apache.log4j.helpers.ThreadLocalMap@1eb0cd0])
and a value of type [java.util.Hashtable] (value [{}]) but failed
to remove it when the web application was stopped. Threads are going to be renewed over time
to try and avoid a probable memory leak.
> I got a bit annoyed by this when I was working on a new example for Apache Camel with
an embedded AMQ broker. So I am digging into fixing this. Its in the start() method.

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