哪位大侠帮着看看这个错啊

用myeclipse的 Create web service form WSDL document(Top-down scenario)方法，导入了一个wsdl文件 生成了一个webservice 运行后就报下面这个错
严重: Couldn't invoke servlet request.
java.lang.NullPointerException
at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilder.addDependency(XmlBeansWSDLBuilder.java:49)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createDocLitPart(WSDLBuilder.java:460)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createPart(WSDLBuilder.java:412)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.writeParameters(WSDLBuilder.java:570)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputParts(WSDLBuilder.java:548)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputMessage(WSDLBuilder.java:373)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createAbstractInterface(WSDLBuilder.java:234)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.write(WSDLBuilder.java:161)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
2011-6-22 17:51:10 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet XFireServlet threw exception
java.lang.NullPointerException
at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilder.addDependency(XmlBeansWSDLBuilder.java:49)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createDocLitPart(WSDLBuilder.java:460)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createPart(WSDLBuilder.java:412)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.writeParameters(WSDLBuilder.java:570)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputParts(WSDLBuilder.java:548)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputMessage(WSDLBuilder.java:373)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createAbstractInterface(WSDLBuilder.java:234)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.write(WSDLBuilder.java:161)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
2011-6-22 17:51:10 org.codehaus.xfire.transport.http.XFireServletController doService
严重: Couldn't invoke servlet request.
java.lang.NullPointerException
at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilder.addDependency(XmlBeansWSDLBuilder.java:49)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createDocLitPart(WSDLBuilder.java:460)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createPart(WSDLBuilder.java:412)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.writeParameters(WSDLBuilder.java:570)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputParts(WSDLBuilder.java:548)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputMessage(WSDLBuilder.java:373)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createAbstractInterface(WSDLBuilder.java:234)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.write(WSDLBuilder.java:161)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
2011-6-22 17:51:10 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet XFireServlet threw exception
java.lang.NullPointerException
at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilder.addDependency(XmlBeansWSDLBuilder.java:49)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createDocLitPart(WSDLBuilder.java:460)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createPart(WSDLBuilder.java:412)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.writeParameters(WSDLBuilder.java:570)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputParts(WSDLBuilder.java:548)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createInputMessage(WSDLBuilder.java:373)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.createAbstractInterface(WSDLBuilder.java:234)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilder.write(WSDLBuilder.java:161)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)