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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1233) Massive connection leak for 204 responses
Date Tue, 11 Sep 2012 15:33:08 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453108#comment-13453108

Oleg Kalnichevski commented on HTTPCLIENT-1233:

Could you please produce a complete wire/context log of the session and attach it to this
> Massive connection leak for 204 responses
> -----------------------------------------
>                 Key: HTTPCLIENT-1233
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1233
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>    Affects Versions: 4.2.1
>            Reporter: Richard DiCroce
> I'm using the fluent API as part of a small Java application to load test a web service
that I'm working on. Some endpoints in this web service consume data and don't return any
data to the client. Server-side, I'm using JAX-RS (specifically, RESTEasy), which returns
a 204 No Content response when an endpoint method returns void.
> I'm not sure if the leak is in HttpClient or in the way the fluent API wraps it, but
connections for which a 204 response is received are never terminated. As a result, more and
more connections are created, until about 16,000 messages have been sent, at which point the
OS won't allow any more connections to be created and the load tester dies with this exception:
> Caused by: java.net.SocketException: No buffer space available (maximum connections reached?):
> 	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
> 	at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
> 	at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
> 	at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
> 	at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
> 	at java.net.PlainSocketImpl.connect(Unknown Source)
> 	at java.net.SocksSocketImpl.connect(Unknown Source)
> 	at java.net.Socket.connect(Unknown Source)
> 	at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
> 	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
> 	at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
> 	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:640)
> 	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
> 	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
> 	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
> 	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
> 	at org.apache.http.client.fluent.Request.execute(Request.java:145)
> 	at com.lapis.cerberus.rest.impl.client.ApacheRestService.sendRequest(ApacheRestService.java:128)
> 	... 2 more
> If I force the endpoint to instead return a 200 OK response, this problem does not occur.
From my end, the only other noticeable difference is that Response.returnResponse().getEntity()
returns null for a 204 response, whereas it is non-null for a 200 response (although HttpEntity.getContentLength()
returns zero).

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