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From "Aymeric Levaux (JIRA)" <>
Subject [jira] [Reopened] (CXF-5063) When using AsyncHttpConduit with a certificate alias CXF hangs after a bunch of requests
Date Thu, 13 Jun 2013 12:41:20 GMT


Aymeric Levaux reopened CXF-5063:

Hi Daniel,

The fix is not working, the getKeyManagersWithCertAlias method has been changed to return
the wrapped KeyManager instead of modifying the TLSClientParameters but the returned KeyManagers
are never used in getSSLContext.

Other questions:
* Is the hashCode check in getSSLContext required? Are there cases where the TLSClientParameters
would change after the first connection has been established? I saw that there is no such
mechanism in the HttpsURLConnectionFactory.
* Should I create a separate issue for the generated catch blocks that are swallowing exceptions?


> When using AsyncHttpConduit with a certificate alias CXF hangs after a bunch of requests
> ----------------------------------------------------------------------------------------
>                 Key: CXF-5063
>                 URL:
>             Project: CXF
>          Issue Type: Bug
>          Components: Transports
>    Affects Versions: 2.7.5
>            Reporter: Aymeric Levaux
>            Assignee: Daniel Kulp
>            Priority: Critical
>             Fix For: 2.7.6
> When using AsyncHttpConduit with a certificate alias CXF hangs after a bunch of requests.

> *Root cause:*
> For each request, when AsyncHTTPConduit.getSSLContext() is called,  the KeyManagers are
wrapped by an AliasedX509ExtendedKeyManager. After some time, the KeyManagers are wrapped
thousands of times. Then, at the moment a new connection needs to be established, a StackOverflowError
is thrown when AliasedX509ExtendedKeyManager.getPrivateKey() is called. This causes the I/O
dispatchers of the HttpAsynClient to all go down one after the other. When all the I/O dispatchers
are down all requests done on the HttpAsyncClient are timing out.
> In AsyncHTTPConduit.getSSLContext() the hash code of the TlsClientParameters is checked
to decide whether or not a new SSLContext should be created. This is not working in this context
as the wrapping of the KeyManagers has an influence on the tlsClientParameters hash code.

> Additionally (not directly linked to the issue), the hash code should never be used as
an identifier. Two different TlsClientParameters might have the same hash code, in such a
case the cached SSLContext won't be refreshed.
> *Other points:*
> * The AsyncHTTPConduit is containing a few auto generated catch blocks (with e.printStackTrace();
> * When the I/O dispatchers are going down (quite an important issue), the error is logged
on the System.err and nothing is logged on the Logger.
> * In the CXF documentation nothing is mentioned on the fact the HttpAsyncClient is still
in beta.

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