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https://issues.apache.org/jira/browse/HTTPCLIENT-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740015#action_12740015
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John Watts commented on HTTPCLIENT-799:
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I found this issue while trying to research this error on my own. I know there
won't be a fix forthcoming, but maybe this will help others who find this issue
as well. That error message seems to be caused when
MultiThreadedHttpConnectionManager tries to free unused connections but can't
find the pool it belongs to in its HashMap of connection pools. The most likely
reason for that is that the key used in the lookup is not equal to the key used
when the connection pool was created. The key in that map is a
HostConfiguration which, among other things, contains a ProtocolSocketFactory.
For me, the problem was that I specified my own ProtocolSocketFactory which
extended SSLProtocolSocketFactory. However, SSLProtocolSocketFactory implements
equals and hashCode to consider all instances of SSLProtocolSocketFactory to be
equal to each other and unequal to everything else. If you don't override them
again, your subclass will have a broken implementation of equals that not only
has a behavior you don't want, but doesn't even follow the equals contract.
There is a caution on the superclass, ProtocolSocketFactory about implementing
equals and hashCode that I think is supposed to prevent this sort of thing but
it still seems a little off. So beware!
> Host connection pool not found, hostConfig=HostConfiguration for no apparent
> reason
> -----------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-799
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-799
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 3.1 Final
> Reporter: Craig
> Priority: Trivial
>
> We see this come up in our logs very frequently. I see absolutely no reason
> why this error would occur, and the error is not a result of an exception -
> the application works without a hitch and without interruption. Here is what
> we see in the log:
> --
> ERROR
> org.apache.commons.httpclient.MultiThreadedHttpConnectionManager
> Host connection pool not found,
> hostConfig=HostConfiguration[host=http://localhost:8082]
> ---
> There is no stack trace or other information.
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