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From "Richard DiCroce (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCLIENT-1233) Massive connection leak for 204 responses
Date Tue, 11 Sep 2012 14:28:08 GMT
Richard DiCroce created HTTPCLIENT-1233:
-------------------------------------------

             Summary: 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?):
connect
	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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