用XFire+MyEclipse开发Web Service问题求助大虾.急啊

为什么外部客户端调用我服务端的webservice接口方法报以下错误？数据3000多条2012-02-02 17:36:27,433 ERROR [http-8080-1] org.codehaus.xfire.handler.DefaultFaultHandler.invoke(35) | Fault occurred!
org.codehaus.xfire.XFireRuntimeException: Error invoking 'syn.ISynWebService.receiveData(java.lang.String, java.lang.String, java.lang.String, java.lang.String)'. Nested exception is java.lang.reflect.InvocationTargetException: null
java.lang.reflect.InvocationTargetException
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 org.codehaus.xfire.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:59)
at org.codehaus.xfire.service.invoker.ObjectInvoker.invoke(ObjectInvoker.java:45)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler.sendMessage(ServiceInvocationHandler.java:320)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler$1.run(ServiceInvocationHandler.java:86)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler.execute(ServiceInvocationHandler.java:134)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:109)
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:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2882)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
at java.lang.StringBuffer.append(StringBuffer.java:224)
at java.io.StringWriter.write(StringWriter.java:84)
at org.jdom.output.XMLOutputter.printQualifiedName(XMLOutputter.java:1578)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:884)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.printContentRange(XMLOutputter.java:1007)
at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:927)
at org.jdom.output.XMLOutputter.output(XMLOutputter.java:375)
at org.jdom.output.XMLOutputter.outputString(XMLOutputter.java:542)
at syn.SynWebServiceImpl.handleData(SynWebServiceImpl.java:205)
at syn.SynWebServiceImpl.receiveData(SynWebServiceImpl.java:54)
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 org.codehaus.xfire.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:59)
at org.codehaus.xfire.service.invoker.ObjectInvoker.invoke(ObjectInvoker.java:45)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler.sendMessage(ServiceInvocationHandler.java:320)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler$1.run(ServiceInvocationHandler.java:86)
at org.codehaus.xfire.service.binding.ServiceInvocationHandler.execute(ServiceInvocationHandler.java:134)
而且一般都是tomcat服务没重启过调用第3次就报错了，如果数据少的话就不报各位大哥们帮帮忙