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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 12216] - WebServiceProxy error handling
Date Thu, 28 Nov 2002 22:21:34 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=12216

WebServiceProxy error handling





------- Additional Comments From adrian@ephox.com  2002-11-28 22:21 -------
I've been working with HttpMultiClient a lot recently and Aurélien Pernoud 
notified me of this bug so I thought I'd point you guys in the direction of the 
fix.  Please see my comments on bug 14005 
(http://nagoya.apache.org/bugzilla/show_bug.cgi?id=14005).

In essence the problem is that there is no side-effect free way in Java to 
determine if a socket is open or closed, so if the server side times out 
HttpClient is left thinking the connection is still open.  Two steps are 
required to fix this:

1. When any exception is thrown HttpClient should close the connection with the 
server so that it returns to a known state.

2. The user of HttpClient needs to catch the IO exception and retry the 
connection.  There are 3 exceptions that HttpClient throws under correct usage:

1. HttpRecoverableException: User should retry the connection, it is expected 
to succeed.

2. HttpException: User should not retry the connection, it will almost 
definitely fail again.

3. IOException: User should retry the connection, it may or may not succeed.

Note that without fixing HttpClient to close the connection when an exception 
is thrown, any retry of the connection will fail with the same IOException 
because the same (unknowingly closed) connection will be reused.  The patch for 
this is expected to be checked into CVS soonish, but is currently waiting on 
the merge between HttpClient and HttpMultiClient.

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