出现问题了，求解答啊

上传能上传成功，当点链接时，就出问题了

Struts Problem Report

Struts has detected an unhandled exception:

Messages:    

Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the tag specified for this action.

File:    org/apache/struts2/dispatcher/StreamResult.java    

Line number:    237    

Stacktraces

java.lang.IllegalArgumentException: Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the tag specified for this action.

   org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:237)
   org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
   com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:374)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:278)
   org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
   com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
   org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
   com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
   com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
   com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
   com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
   com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
   org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
   org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511)
   org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
   org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
   org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
   org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
   java.lang.Thread.run(Thread.java:744)    

You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra debugging behaviors and reports to assist developers. To disable this mode, set:

 struts.devMode=false

in your WEB-INF/classes/struts.properties file.