我正在使用 JBoss AS 5.0.0。我以“默认”配置启动它，其中一些 Web 服务被部署为 *.ear 文件。客户端发送 SOAP 消息并获得有效响应，并以这种方式与服务器通信。但有时会抛出异常，服务器不再响应。
这是堆栈跟踪：
17:58:00,546 ERROR [STDERR] 12.09.2012 17:58:00 com.sun.xml.ws.transport.http.servlet.WSServletDelegate doGet
SEVERE: caught throwable
javax.xml.ws.WebServiceException: javax.xml.stream.XMLStreamException
at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:112)
at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:284)
at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:339)
at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:93)
at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:481)
at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244)
at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135)
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:129)
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:160)
at com.sun.xml.ws.transport.http.servlet.WSServlet.doPost(WSServlet.java:75)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.xml.stream.XMLStreamException
at com.sun.xml.stream.writers.XMLStreamWriterImpl.flush(XMLStreamWriterImpl.java:402)
at com.sun.xml.ws.streaming.XMLStreamWriterUtil.getOutputStream(XMLStreamWriterUtil.java:97)
at com.sun.xml.ws.message.jaxb.JAXBMessage.writePayloadTo(JAXBMessage.java:319)
at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:142)
at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:109)
... 31 more
18:02:00,482 ERROR [STDERR] 12.09.2012 18:02:00 com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit handle
SEVERE: Couldn't create SOAP message due to exception: Unable to create StAX reader or writer
com.sun.xml.ws.protocol.soap.MessageCreationException: Couldn't create SOAP message due to exception: Unable to create StAX reader or writer
at com.sun.xml.ws.encoding.SOAPBindingCodec.decode(SOAPBindingCodec.java:365)
at com.sun.xml.ws.transport.http.HttpAdapter.decodePacket(HttpAdapter.java:277)
at com.sun.xml.ws.transport.http.HttpAdapter.access$500(HttpAdapter.java:93)
at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:457)
at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244)
at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135)
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:129)
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:160)
at com.sun.xml.ws.transport.http.servlet.WSServlet.doPost(WSServlet.java:75)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: com.sun.xml.ws.streaming.XMLReaderException: Unable to create StAX reader or writer
at com.sun.xml.ws.api.streaming.XMLStreamReaderFactory$Zephyr.doCreate(XMLStreamReaderFactory.java:334)
at com.sun.xml.ws.api.streaming.XMLStreamReaderFactory.doCreate(XMLStreamReaderFactory.java:201)
at com.sun.xml.ws.api.streaming.XMLStreamReaderFactory.create(XMLStreamReaderFactory.java:154)
at com.sun.xml.ws.encoding.StreamSOAPCodec.decode(StreamSOAPCodec.java:301)
at com.sun.xml.ws.encoding.StreamSOAPCodec.decode(StreamSOAPCodec.java:129)
at com.sun.xml.ws.encoding.SOAPBindingCodec.decode(SOAPBindingCodec.java:360)
... 30 more
Caused by: javax.xml.stream.XMLStreamException
at com.sun.xml.stream.XMLReaderImpl.setInputSource(XMLReaderImpl.java:197)
at com.sun.xml.stream.XMLReaderImpl.setInputSource(XMLReaderImpl.java:207)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.xml.ws.api.streaming.XMLStreamReaderFactory$Zephyr.reuse(XMLStreamReaderFactory.java:342)
at com.sun.xml.ws.api.streaming.XMLStreamReaderFactory$Zephyr.doCreate(XMLStreamReaderFactory.java:325)
... 35 more
我应该以何种方式进行调查或其他建议将不胜感激。