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https://issues.apache.org/jira/browse/AXIS2-2593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492714
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Michele Mazzucco commented on AXIS2-2593:
-----------------------------------------
According to [1] HttpClient uses persistent connections (i.e. multiple http
requests use the same socket) by default, then it should not be possible to
have > 1000 open connections (the tuning parameters on windows are just a
workaround, as David correctly pointed out).
[2] explains that there's a 1:1 ratio between HttpConnection(s) and open
sockets, so I guess the problem is that when a ServiceClient is reused every
few send operations a new connection is created. A quick look to the code does
not reveal any problem: the CommonsHTTPTransportSender class simply creates a
new HttpSender in writeMessageWithCommons(), but then the client is correctly
reused, if available (see AbstractHTTPSender.getHttpClient()).
Instead previous posts like [3] seems to indicate that even the HttpClient is
reused, every few requests a new connection is opened.
[1]
http://jakarta.apache.org/commons/httpclient/performance.html#Connection_persistence
[2] http://www.innovation.ch/java/HTTPClient/advanced_info.html#conn_details
[3]
http://www.nabble.com/Apache-Axis-2%3A-how-to-get-header--Options-tf3604648.html#a10086555
> Web Service request loop causes many TIME_WAIT Connections & "BindException:
> Address already in use: connect"
> -------------------------------------------------------------------------------------------------------------
>
> Key: AXIS2-2593
> URL: https://issues.apache.org/jira/browse/AXIS2-2593
> Project: Axis 2.0 (Axis2)
> Issue Type: Bug
> Affects Versions: 1.1.1, nightly
> Environment: Windows XP, Tomcat, Axis2 nightly build (also
> encountered in 1.1.1), JiBX 1.1.3, Microsoft Windows XP [Version 5.1.2600],
> 126 GB free disk space, 1GB RAM.
> Reporter: David Bueche
> Priority: Critical
>
> I am performing the following:
> - Executing a tight loop calling a singel web service
> - Using the same Stub over and over
> - Creating the Stub with a custom ConfigurationContext (see below)
> - Sending cleanup() to Stub after each message sent (although problem existed
> even before cleanup() was added)
> After approximately 4000 messages have been sent, an AxisFault is generated
> caused by the following exception (see below for full stack trace):
> java.net.BindException: Address already in use: connect
> It appears that connections from the client to Axis on Tomcat sometimes (but
> not always) remain in the TIME_WAIT state for several minutes. There are
> 1200-1500 TIME_WAIT connections open when the AxisFault is generated.
> If I step through the web service messages in a debugger, the problem does
> not appear to occur, as the system eventually releases the connections after
> a minute or two.
> Also, if I insert a System.gc() in the client code each time it sends a
> message to the web service (the commented out line of code below), the
> AxisFault does not occur. I have executed the loop over 60,000 times with
> the garbage collection included without generating an AxisFault. There were
> only 400-700 connections in the TIME_WAIT state at a given time, but
> performance slowed down to a crawl.
> Here is the code I am using to create the Stub:
> HttpConnectionManagerParams connectionManagerParams = new
> HttpConnectionManagerParams();
> connectionManagerParams.setTcpNoDelay(true);
> connectionManagerParams.setStaleCheckingEnabled(true);
>
> MultiThreadedHttpConnectionManager connectionManager = new
> MultiThreadedHttpConnectionManager();
> connectionManager.setParams(connectionManagerParams);
> HttpClient httpClient = new HttpClient(connectionManager);
>
> ConfigurationContext configurationContext =
> ConfigurationContextFactory.createConfigurationContextFromFileSystem(null,
> null);
> configurationContext.setProperty(HTTPConstants.REUSE_HTTP_CLIENT,
> Boolean.TRUE);
> configurationContext.setProperty(HTTPConstants.CACHED_HTTP_CLIENT,
> httpClient);
>
> stub = new MyServiceStub(configurationContext, target);
>
> boolean success = true;
> while(success) {
> success = stub.performService(records);
> stub.cleanup();
> // System.gc();
> }
> Here is the complete stack trace:
> Exception in thread "main" org.apache.axis2.AxisFault: Address already
> in use: connect
> at org.apache.axis2.AxisFault.makeFault(AxisFault.java:377)
> at
> org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:179)
> at
> org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:73)
> at
> org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:310)
> at
> org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:202)
> at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:446)
> at
> org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:330)
> at
> org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:294)
> at
> com.ws.service.MyServiceStub.performService(MyServiceStub.java:300)
> at com.ws.client.MyClient.main(MyClient.java:88)
> Caused by: java.net.BindException: Address already in use: connect
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
> at
> java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
> at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
> at java.net.Socket.connect(Socket.java:519)
> at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at
> org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:139)
> at
> org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:124)
> at
> org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
> at
> org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
> at
> org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
> at
> org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
> at
> org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
> at
> org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:558)
> at
> org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:176)
> ... 8 more
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