最新做了一个项目，给别人提供webservice出现以下错误

服务端解析方法String s = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
SAXBuilder builder = null;
Document doc = null;
try {
builder = new SAXBuilder("org.apache.xerces.parsers.SAXParser");// 读取解析XML文件的驱动
StringReader sr = new StringReader(xml);
doc = builder.build(sr);
Element rootEle = null;
if (doc != null) {
rootEle = doc.getRootElement();
         List list = rootEle.getChildren("DEPARTCALENDAR");
if (list.size() > 0) {
Element departWorkInfo1 = (Element) list.get(0);
平常白天测试没问题，只要晚上执行定时任务调用时就报错[2010-08-31 00:25:48] java.lang.IllegalStateException: Can't overwrite cause
[2010-08-31 00:25:48] Fault occurred!
java.lang.IllegalStateException: Can't overwrite cause
at java.lang.Throwable.initCause(Throwable.java:320)
at com.ctc.wstx.compat.Jdk14Impl.setInitCause(Jdk14Impl.java:70)
at com.ctc.wstx.exc.WstxException.<init>(WstxException.java:46)
at com.ctc.wstx.exc.WstxIOException.<init>(WstxIOException.java:16)
at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:313)
at org.codehaus.xfire.soap.SoapSerializer.writeMessage(SoapSerializer.java:88)
at org.codehaus.xfire.transport.http.HttpChannel.writeWithoutAttachments(HttpChannel.java:56)
at org.codehaus.xfire.transport.http.XFireServletChannel.sendViaServlet(XFireServletChannel.java:87)
at org.codehaus.xfire.transport.http.XFireServletChannel.send(XFireServletChannel.java:44)
at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.service.binding.PostInvocationHandler.invoke(PostInvocationHandler.java:36)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.transport.DefaultEndpoint.onReceive(DefaultEndpoint.java:64)
at org.codehaus.xfire.transport.AbstractChannel.receive(AbstractChannel.java:38)
at org.codehaus.xfire.transport.http.XFireServletController.invoke(XFireServletController.java:304)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:129)
at org.codehaus.xfire.transport.http.XFireServlet.doPost(XFireServlet.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)
[2010-08-31 00:25:48] Could not send fault.
java.lang.IllegalStateException: Can't overwrite cause
at java.lang.Throwable.initCause(Throwable.java:320)
at com.ctc.wstx.compat.Jdk14Impl.setInitCause(Jdk14Impl.java:70)
at com.ctc.wstx.exc.WstxException.<init>(WstxException.java:46)
at com.ctc.wstx.exc.WstxIOException.<init>(WstxIOException.java:16)
at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:313)
at org.codehaus.xfire.soap.SoapSerializer.writeMessage(SoapSerializer.java:88)
at org.codehaus.xfire.transport.http.HttpChannel.writeWithoutAttachments(HttpChannel.java:56)
at org.codehaus.xfire.transport.http.XFireServletChannel.sendViaServlet(XFireServletChannel.java:87)
at org.codehaus.xfire.transport.http.XFireServletChannel.send(XFireServletChannel.java:44)
at org.codehaus.xfire.fault.FaultSender.invoke(FaultSender.java:37)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.handler.DefaultFaultHandler.sendFault(DefaultFaultHandler.java:88)
at org.codehaus.xfire.handler.DefaultFaultHandler.invoke(DefaultFaultHandler.java:51)
at org.codehaus.xfire.service.binding.PostInvocationHandler.invoke(PostInvocationHandler.java:50)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.transport.DefaultEndpoint.onReceive(DefaultEndpoint.java:64)
at org.codehaus.xfire.transport.AbstractChannel.receive(AbstractChannel.java:38)
at org.codehaus.xfire.transport.http.XFireServletController.invoke(XFireServletController.java:304)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:129)
at org.codehaus.xfire.transport.http.XFireServlet.doPost(XFireServlet.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)