错误代码是java.io.IOException：服务器返回HTTP响应代码：URL为500：调用我拥有的Web服务URL时出现异常。
我正在通过一个用java构建的框架调用一个基于.NET的Web服务，并获得：
从服务器传回的信头：

Content-Length:736
Content-Type:text/xml; charset=utf-8
Server:Microsoft-IIS/7.0
X-Powered-By:ASP.NET
Date:Thu, 12 May 2011 08:51:45 GMT

java.io.IOException: Server returned HTTP response code: 500 for URL: "http://hcd
cd-bt01.hcch.com/HCCExceptionLogService/service.svc?wsdl"
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon
nection.java:1170)
        at com.splwg.mpl.senders.http.HTTPSender.sendResponse(HTTPSender.java:34
5)
        at com.splwg.mpl.sending.NewSenderManager.sendResponse(NewSenderManager.
java:191)
        at com.splwg.mpl.sending.SameThreadSendingManager.callSender(SameThreadS
endingManager.java:63)
        at com.splwg.mpl.stagingtable.download.OutboundMessageSender.handleRouti
ngs(OutboundMessageSender.java:361)
        at com.splwg.mpl.stagingtable.download.OutboundMessageSender.sendRespons
e(OutboundMessageSender.java:95)
        at com.splwg.mpl.sending.NewSenderManager.sendResponse(NewSenderManager.
java:191)
        at com.splwg.mpl.sending.SameThreadSendingManager.processDestination(Sam
eThreadSendingManager.java:293)
        at com.splwg.mpl.sending.SameThreadSendingManager.sendResponse(SameThrea
dSendingManager.java:252)
        at com.splwg.mpl.sending.SameThreadSendingManager.doSend(SameThreadSendi
ngManager.java:208)
        at com.splwg.mpl.server.async.ExecSendRequestProcessor.ProcessRequest(Ex
ecSendRequestProcessor.java:61)
        at com.splwg.mpl.server.async.RequestProcessingThreadAdapter.run(Request
ProcessingThreadAdapter.java:46)
        at com.splwg.mpl.server.PooledThread.run(PooledThread.java:91)
        at java.lang.Thread.run(Thread.java:595)

我正在调用的wsdl url是http://hcdcdbt01.hcch.com/HCCExceptionLogService/service.svc?wsdl
我已经使用SOAP UI 3.6.1工具来测试这个WSDL，它给了我正确的结果。
我使用的标题是：

Content-Type: text/xml;charset=UTF-8
SOAPAction: "http://tempuri.org/IExceptionLogService/LogException"
POST
Host:hcdcd-bt01.hcch.com
http://hcdcd-bt01.hcch.com/HCCExceptionLogService/service.svc

SOAP UI标题：

POST http://hcdcd-bt01.hcch.com/HCCExceptionLogService/service.svc HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: text/xml;charset=UTF-8
SOAPAction: "http://tempuri.org/IExceptionLogService/LogException"
User-Agent: Jakarta Commons-HttpClient/3.1
Host: hcdcd-bt01.hcch.com
Content-Length: 763

谁能告诉我哪里出了问题？