javax.faces.event.AbortProcessingException：找不到方法：com.xx.xx.xx.abc@8ff4b0.uploadedFile()

Question

单击按钮时出现此异常。方法在类中定义得很好，应用程序也运行良好。但仍然遇到这个异常。

Dec 21, 2011 5:50:17 PM com.sun.faces.context.ExceptionHandlerImpl log
SEVERE: JSF1073: javax.faces.event.AbortProcessingException caught during processing of PROCESS_VALIDATIONS 3 : UIComponent-ClientId=formName:file, Message=Method not found: [email protected]()
Dec 21, 2011 5:50:17 PM com.sun.faces.context.ExceptionHandlerImpl log
SEVERE: Method not found: [email protected]()
javax.faces.event.AbortProcessingException: Method not found: [email protected]()
      at javax.faces.event.MethodExpressionValueChangeListener.processValueChange(MethodExpressionValueChangeListener.java:153)
      at javax.faces.event.ValueChangeEvent.processListener(ValueChangeEvent.java:134)
      at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:772)
      at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:740)
      at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1182)
      at org.springframework.faces.webflow.FlowLifecycle.invokePhase(FlowLifecycle.java:121)
      at org.springframework.faces.webflow.FlowLifecycle.execute(FlowLifecycle.java:70)
      at org.springframework.faces.webflow.JsfView.processUserEvent(JsfView.java:114)
      at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:248)
      at org.springframework.webflow.engine.ViewState.resume(ViewState.java:218)
      at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
      at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
      at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
      at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
      at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
      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.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:357)
      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 com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:60)
      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$Http11ConnectionHandler.process(Http11Protocol.java:583)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:379)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)

知道为什么抛出这个异常吗？

Answer 1

valueChangeListener 方法应具有以下签名：

public void uploadedFile(ValueChangeEvent event) {
    // ...
}

请注意 ValueChangeEvent 属性。鉴于您的应用程序“工作正常”，您显然根本不需要 valueChangeListener 。也许您将其与 value 属性混淆（甚至重复）。将侦听器方法命名为“uploadedFile”是没有意义的，这对于属性来说更有意义。 上一个问题也证实了这一点。