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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Tomcat 5.5 doesn't support keep-alive?
Date Mon, 16 May 2011 16:16:46 GMT
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Tim,

On 5/16/2011 4:06 AM, Tim Stibbs wrote:
> I have a java client that is making a large number of calls to a servlet
> running in a web app in tomcat 5.5.28. I have noticed that if the client
> process runs for too long, the client machine runs out of ports throwing a
> "java.net.BindException: Address already in use: connect". I thought that
> java's URLConnection maintained an internal pool of connections, and that so
> long as keep alive was enabled it would re-use the connections.

The Javadoc for java.net.URL has this to say about the openConnection
method:

"A new connection is opened every time by calling the openConnection
method of the protocol handler for this URL."

That seems to be conflicting with this other documentation:

http://download.oracle.com/javase/1.5.0/docs/guide/net/http-keepalive.html

... which says that keep-alive is transparent. I don't see you setting a
"Connection: keep-alive" header, which you probably should be doing. The
example code in the above document does /not/ explicitly set this
header, but it couldn't hurt.

You should also check this out:
http://forums.java.net/node/656951

Evidently, not properly reading the server's response could be a
problem, too. Note that HttpURLConnection requires that you monitor two
separate streams for responses: the output and error streams. You should
drain one or the other stream based upon the response code you get from
the server.

- -chris
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