Fails under some load

[Daniil Chipenko]

Good day,

I'm using Axis2 1.4 with tomcat5.5 and created both service and client from
a scratch with AXIOM via HTTP port.
 And they worked together like charm, just before i'm beggining to put them
under some load. Even when there is just 3 simultaneous calls - one of my
client threads written with AXIOM begins to throw varied exceptions without
any stack trace, like:

org.apache.axiom.om.OMException
      or
org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException:
ParseError at [row,col]:[1,1]
Message: An invalid XML character (Unicode: 0x0) was found in the comment.
      or
com.sun.org.apache.xerces.internal.xni.XNIException: Scanner State 7 not
Recognized
      or
org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException:
ParseError at [row,col]:[1,1]
Message: Open quote is expected for attribute "{1}" associated with an
element type  "name".
     or

... and this happens not always, but approx. 1/3 times   of  3 simultaneus
threads starts.

Here is my code:

  OMElement method = fac.createOMElement(new QName(chartName));

                for(String key : keys){
                    OMElement value = fac.createOMElement(new QName(key));
                    String mapvalue = ((String[]) params.get(key))[0];
                    value.addChild(fac.createOMText(value, mapvalue));
                    method.addChild(value);
                }

               Options options = new Options();
                options.setTo(ApplicationProperties.targetEPRFinance);
                options.setTransportInProtocol(Constants.TRANSPORT_HTTP);
                OMElement result = fac.createOMElement(new
QName("EmptyResult"));

                System.out.println("Payload for service: " +
method.toString());

                try {
                    ServiceClient sender = new ServiceClient();
                    sender.setOptions(options);
                    result = sender.sendReceive(method);
                } catch (AxisFault e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                System.out.println("Result from service: " +
result.toString());

I would be happy by any advices.

Bye,
Daniil Chipenko