javax.faces.event.AbortProcessingException：找不到方法：[email protected]（）

Question

我收到此異常時單擊按鈕。方法在類中定義得很好，應用程序也工作正常。但仍然得到這個例外。

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: com.xx.xx.xx.abc@8ff4b0.uploadedFile() 
Dec 21, 2011 5:50:17 PM com.sun.faces.context.ExceptionHandlerImpl log 
SEVERE: Method not found: com.xx.xx.xx.abc@8ff4b0.uploadedFile() 
javax.faces.event.AbortProcessingException: Method not found: com.xx.xx.xx.abc@8ff4b0.uploadedFile() 
     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) 

任何想法爲什麼這個異常被拋出？

Answer 1

的valueChangeListener方法應具有以下特徵：

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

請注意ValueChangeEvent屬性。鑑於您的應用程序「工作正常」，您顯然根本不需要valueChangeListener。也許你會將它與value屬性混淆（甚至重複）。命名監聽器方法「uploadedFile」是沒有意義的，這對於一個屬性更有意義。您的previous question上的代碼片段也證實了這一點。