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https://issues.apache.org/jira/browse/AMQ-4008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445787#comment-13445787
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Claus Ibsen commented on AMQ-4008:
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Fixed the MDC leak reported by Tomcat. 

Now hunting another issue when embedding Camel together and routing messages

Aug 31, 2012 11:13:35 AM org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: The web application [/camel-example-activemq-tomcat] appears to have 
started a thread named [ActiveMQ Task-1] but has failed to stop it. This is 
very likely to create a memory leak.
                
> Tomcat WARN on shutdown about ThreadLocal not cleared from log4j
> ----------------------------------------------------------------
>
>                 Key: AMQ-4008
>                 URL: https://issues.apache.org/jira/browse/AMQ-4008
>             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 [{activemq.broker=myBroker}]) 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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