如何获取网络服务异常的原因

Question

我如何得到我的网络服务中发生的异常原因？ （我有jsf 1.2项目和其他两个项目，我应该作为Web服务）我有Web服务，当被调用时应该做一些从数据库读取并返回字符串作为结果，但是当我尝试这样做时，我得到以下错误（BioskopBean方法是从Web服务调用方法）：

WARNING: Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled. 

AxisFault 
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException 
faultSubcode: 
faultString: java.lang.reflect.InvocationTargetException 
faultActor: 
faultNode: 
faultDetail: 
    {http://xml.apache.org/axis/}hostname:acer-PC 

java.lang.reflect.InvocationTargetException 
at org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder.java:222) 
at org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.java:129) 
at org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1087) 
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) 
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) 
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) 
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) 
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) 
at javax.xml.parsers.SAXParser.parse(Unknown Source) 
at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227) 
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696) 
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435) 
at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62) 
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206) 
at org.apache.axis.client.Call.invokeEngine(Call.java:2784) 
at org.apache.axis.client.Call.invoke(Call.java:2767) 
at org.apache.axis.client.Call.invoke(Call.java:2443) 
at org.apache.axis.client.Call.invoke(Call.java:2366) 
at org.apache.axis.client.Call.invoke(Call.java:1812) 
at com.majkicservis.bioskop.BioskopSoapBindingStub.getFilmove(BioskopSoapBindingStub.java:115) 
at com.majkic.bioskop.BioskopBean.prikaziFilmove(BioskopBean.java:74) 
at com.majkic.bioskop.BioskopBean.<init>(BioskopBean.java:33) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
at java.lang.reflect.Constructor.newInstance(Unknown Source) 
at java.lang.Class.newInstance0(Unknown Source) 
at java.lang.Class.newInstance(Unknown Source) 
at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188) 
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:106) 
at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:406) 
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:215) 
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:199) 
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:76) 
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:173) 
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:200) 
at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:68) 
at org.apache.el.parser.AstValue.getValue(AstValue.java:112) 
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) 
at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101) 
at javax.faces.component.UIData.getValue(UIData.java:614) 
at javax.faces.component.UIData.getDataModel(UIData.java:1145) 
at javax.faces.component.UIData.setRowIndex(UIData.java:451) 
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:77) 
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:816) 
at javax.faces.component.UIData.encodeBegin(UIData.java:983) 
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:234) 
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:180) 
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:127) 
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:840) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930) 
at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) 
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:840) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933) 
at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:266) 
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:197) 
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) 
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) 
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) 
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:349) 
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:127) 
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:298) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
at java.lang.Thread.run(Unknown Source) 

PS我试图让其他Web服务只返回字符串，它的工作原理，但在上面的项目中，我找不出是什么导致此错误

Answer 1

当解释堆栈跟踪，一个好的起点是跳过调用外部库并找到你写的代码。

com.majkicservis.bioskop.BioskopSoapBindingStub.getFilmove(BioskopSoapBindingStub.java:115) 

从那里，你的东西代码调用扔了java.lang.reflect.InvocationTargetException，这意味着它试图访问不存在的bean属性或者其豆没有实现Serializable。您是否期望使用属性“hostname”读取或写入对象？