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From "John Watts (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-799) Host connection pool not found, hostConfig=HostConfiguration for no apparent reason
Date Thu, 06 Aug 2009 12:09:14 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740015#action_12740015
] 

John Watts commented on HTTPCLIENT-799:
---------------------------------------

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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