axis2调用WebService出现Timeout waiting for connection

最近在项目中遇到使用Axis2版本1.5.4调用Webservice不定期的出现Timeout waiting for connection的问题，但是我自己调试的时候一直无法重现问题（调试版本1.6.2），纠结半天，感觉像是版本不同而引起的，于是查了一下文档，发现真是版本的问题。调用代码如下：

RPCServiceClient serviceClient = new RPCServiceClient();
Options options = serviceClient.getOptions();
String transport = "http://10.50.81.49";
// 指定调用WebService的URL
EndpointReference targetEPR = new EndpointReference(transport + "/back_sms/interfaces/smsInterface?wsdl");
options.setAction("sendSms");
options.setTo(targetEPR);
String smsContent = "255555522222222222266522222222222";
Object[] opAddEntryArgs = new Object[] { "gms","gms#2016","13910565512",smsContent  };
@SuppressWarnings("rawtypes")
Class[] classes = new Class[] { String.class };
QName opAddEntry = new QName("http://webservice.sms.foresealife.com/","sendSms");
String result = serviceClient.invokeBlocking(opAddEntry,
opAddEntryArgs, classes)[0].toString();
System.out.println("调用短信平台结果=="+result);

异常信息如下：

2016-08-05 10:11:05,922 INFO  [org.apache.axis2.transport.http.HTTPSender] (Timer-5) Unable to sendViaPost to url[http://<span style="font-family: Arial, Helvetica, sans-serif;">10.50.81.49</span><span style="font-family: Arial, Helvetica, sans-serif;">/back_sms/interfaces/smsInterface]</span>
org.apache.commons.httpclient.ConnectionPoolTimeoutException: Timeout waiting for connection
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.doGetConnection(MultiThreadedHttpConnectionManager.java:490)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.getConnectionWithTimeout(MultiThreadedHttpConnectionManager.java:394)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:152)
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:557)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:199)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:76)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:400)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:225)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:438)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:402)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:540)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:521)
at org.apache.axis2.rpc.client.RPCServiceClient.invokeBlocking(RPCServiceClient.java:102)
at com.foresealife.sms.webservice.SmsAxis2Client.sendSms(SmsAxis2Client.java:51)
at com.sinosoft.smsInterface.SmsServicePub.sendMessage(SmsServicePub.java:34)
at com.sinosoft.utility.SMSNewCallDataTimerTask.run(SMSNewCallDataTimerTask.java:79)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
2016-08-05 10:11:05,923 INFO  [STDOUT] (Timer-5) 调用短信平台(ESB)异常

解决方案：

1、使用高版本的axis2，我使用版本1.6.2是没有问题的，查看了一下Apache的官方文档说这个是版本1.5.1之后的一个BUG，至于在哪个版本修复了没明确说明，具体参考：https://issues.apache.org/jira/browse/AXIS2-4797

2、修改调用代码，增加三行加粗的代码，如下：

RPCServiceClient serviceClient = new RPCServiceClient();
Options options = serviceClient.getOptions();
String transport = "http://10.50.81.49";
// 指定调用WebService的URL
EndpointReference targetEPR = new EndpointReference(transport + "/back_sms/interfaces/smsInterface?wsdl");
options.setAction("sendSms");
options.setTo(targetEPR);
options.setManageSession(true);
options.setProperty(HTTPConstants.REUSE_HTTP_CLIENT,true);
String smsContent = "255555522222222222266522222222222";
Object[] opAddEntryArgs = new Object[] { "gms","gms#2016","13910565512",smsContent  };
@SuppressWarnings("rawtypes")
Class[] classes = new Class[] { String.class };
QName opAddEntry = new QName("http://webservice.sms.foresealife.com/","sendSms");
String result = serviceClient.invokeBlocking(opAddEntry,
opAddEntryArgs, classes)[0].toString();
serviceClient.cleanupTransport();
System.out.println("调用短信平台结果=="+result);

感谢博主的分享：http://blog.csdn.net/liufeng520/article/details/8464211