Intermittent, automatic connection refused with no packets to or from the server

[Grover Smith]

Greetings All,

 

I am having some strange, intermittent connection refused problems with
the Axis2 client. I have used Axis2 1.4.1 to construct a java stub class
from a SOAP server WSDL.  In a jboss server, I instantiate the stub and
use it to send requests to the SOAP server.  This generally works fine,
but occasionally (as often as once a day), the Axis2 engine will begin
to throw Connection refused faults on every SOAP call.  The strange
thing is, in this state ngrep shows zero packets to or from the SOAP
server.  It seems clear that the connection refused faults are generated
without ever attempting to communicate with the SOAP server.  At this
point, only redeploying the application will fix the issue. Even
instantiating a new stub will not allow communication to resume. Does
anyone have any ideas what might be happening and how it can be fixed?
If nothing else, is there a way to reinitialize the Axis engine without
redeploying?

 

 

This is the stub initialization code.  It is also called when we want to
reinitialize the connection (such as when we detect a config change or
when we get into this state where communication is failing)

 

public void start() {

  HttpTransportProperties.Authenticator authenticator = new
HttpTransportProperties.Authenticator();

  authenticator.setPreemptiveAuthentication (true);

  authenticator.setAuthSchemes(Arrays.asList(new
String[]{HttpTransportProperties.Authenticator.BASIC}));

  authenticator.setUsername(BasicAuthUserName);

  authenticator.setPassword(BasicAuthPassword);           

  TransportOutDescription tod = new
TransportOutDescription(org.apache.axis2.Constants.TRANSPORT_HTTPS); 

  CommonsHTTPTransportSender httpSender = new
CommonsHTTPTransportSender();                                

  tod.setSender(httpSender);

  if(null != stub) {

    try {

 
stub._getServiceClient().getOptions().setProperty(HTTPConstants.AUTO_REL
EASE_CONNECTION, Boolean.TRUE);

 
stub._getServiceClient().getOptions().setCallTransportCleanup(true);

    } catch (Throwable e) {

      LOG.warn("error when trying to clean up old Axis stub",e);

    }

  }

  try {      

    ConfigurationContext c =
ConfigurationContextFactory.createEmptyConfigurationContext(); 

    c.setProperty("WSAddressingVersion",
"http://schemas.xmlsoap.org/ws/2004/08/addressing";); 

    stub = new Address_ServiceStub(c, URL);

    stub._getServiceClient().getOptions().setProperty(
HTTPConstants.AUTHENTICATE,authenticator);

 
stub._getServiceClient().getOptions().setProperty(org.apache.axis2.addre
ssing.AddressingConstants.WS_ADDRESSING_VERSION,org.apache.axis2.address
ing.AddressingConstants.Submission.WSA_NAMESPACE);

    stub._getServiceClient().getOptions().setTransportOut(tod);


 
stub._getServiceClient().getOptions().setProperty(HTTPConstants.REUSE_HT
TP_CLIENT, Boolean.FALSE); 

 
stub._getServiceClient().getOptions().setProperty(HTTPConstants.CACHED_H
TTP_CLIENT, Boolean.FALSE); 

           

  } catch (AxisFault e) {                                    

    LOG.error("start: Exception when setting up communication with xyz",
e);                                                      

  }                            

}

 

 

This is a portion of the fault stack we are getting:

 

2009-01-27 22:31:37,264 [http-0.0.0.0-8080-10] ERROR [...] Exception
when attempting to communicate with xyx server.

org.apache.axis2.AxisFault: Connection refused

        at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)

        at
org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:1
93)

        at
org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)

        at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageW
ithCommons(CommonsHTTPTransportSender.java:371)

        at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(Common
sHTTPTransportSender.java:209)

        at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:448)

        at
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOper
ation.java:401)

        at
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInA
xisOperation.java:228)

        at
org.apache.axis2.client.OperationClient.execute(OperationClient.java:163
)

        at
com._xyz.soap.wsdl.Address_ServiceStub.validateAddressRequest(Address_Se
rviceStub.java:2511)