Weblogic 8.1 - Axis 1.2.1 (NullPointerException)

[mtim]

Hello, 

Have anyone encountered the same weird problem ? 

I'm getting NullPointerException from Axis in the following conditions: 
1. weblogic 8.1 is configured to use jrockit81sp3_142_04
2. request contains SOAP header  with simple element with text value. 

Axis sends fault response back without any stack trace , only soap
fault string: java.lang.NullPointerException.
After debugging I found that actual exception happens in:
org.apache.axis.message.MessageElement(1388)


Here is how it can be reproduced: 
runtime :  Weblogic 8.1 (jrockit81sp3_142_04) , Axis 1.2.1 final
I generated a stubs for default Axis web service "Version" and here is
sample code with request/response snapshots

VersionServiceLocator loc = new VersionServiceLocator();
Version ver = loc.getVersion(new
URL("http://localhost:9999/axis/services/Version";));
((Stub)ver).setHeader("http://localhost:7001/axis/services/Version";,
"XXXXXXXXXX", "YYYYYYYYYYY");
ver.getVersion();

-------- REQUEST ----------
<?xml version="1.0" encoding="UTF-8"?>
   <soapenv:Envelope
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
      <soapenv:Header>
         <ns1:XXXXXXXXXX
soapenv:actor="http://schemas.xmlsoap.org/soap/actor/next";
soapenv:mustUnderstand="0" xsi:type="soapenc:string"
xmlns:ns1="http://localhost:7001/axis/services/Version";
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/";>YYYYYYYYYYY</ns1:XXXXXXXXXX>
      </soapenv:Header>
      <soapenv:Body>
         <ns2:getVersion
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/";
xmlns:ns2="http://axis.apache.org"/>
      </soapenv:Body>
   </soapenv:Envelope>

-------- RESPONSE ----------
<?xml version="1.0" encoding="utf-8"?>
   <soapenv:Envelope
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
      <soapenv:Body>
         <soapenv:Fault>
            <faultcode>soapenv:Server.userException</faultcode>
            <faultstring>java.lang.NullPointerException</faultstring>
            <detail>
               <ns1:hostname
xmlns:ns1="http://xml.apache.org/axis/";>client_machine</ns1:hostname>
            </detail>
         </soapenv:Fault>
      </soapenv:Body>
   </soapenv:Envelope>