struts file upload strange error

Bryan Hunt Mon, 03 May 2004 13:05:18 -0700

Hi there list, I have been trying to get the most simple file upload example working with and have been receiving a strange error message that I just can't seem to shake.

Here is the basics of my action form snip= public class ImageUploadForm extends ActionForm { // --------------------------------------------------------- Instance Variables /** imageFile property */ protected FormFile file;

// --------------------------------------------------------- Methods

public ActionErrors validate( ActionMapping mapping, HttpServletRequest request) { if(file == null){ System.out.println("file is empty"); } return null; }

   public FormFile getFile() {
       return file;
   }

   public void setFile(FormFile file) {
       this.file = file;
   }
=snip

Here is the basics of the action snip= public ActionForward execute( blah) { System.out.println("at least i managed to get called"); throw new UnsupportedOperationException("Generated method 'execute(...)' not implemented."); } =snip

Here is the basics from my struts config file snip= <form-bean name="imageUploadForm" type="ie.jestate.struts.form.ImageUploadForm"> <form-property name="file" type="org.apache.struts.upload.FormFile" /> </form-bean> <action attribute="imageUploadForm" input="/form/imageUpload.jsp" name="imageUploadForm" path="/imageUpload" type="ie.jestate.struts.action.ImageUploadAction" scope="request" validate="true" > <forward name="imageuploadsuccess" path="/form/imageUpload.jsp" /> </action> =snip

Here is the jsp file

snip=
<%@ page language="java"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"; prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"; prefix="html"%>
<html>
   <head>
       <title>JSP for imageUploadForm form</title>
   </head>
   <body>
       <html:form action="/imageUpload.do" type="imageUploadForm" >
           File :
             <html:file property="file"/>
           <html:submit/>
       </html:form>
   <body>
   </html>
=snip

And here is the abreviated version of the error message
snip=

*exception*

javax.servlet.ServletException: BeanUtils.populate
        org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1254)
        
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)*

cause mère*

java.lang.IllegalArgumentException: argument type mismatch
        sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
=snip

I have tried changing the type to text and the type to String in the form and that works but use this FormFile class and everything seems to go fubar.

It never even gets to call the action , instead it generates this error message , but the setters and getters are right and the variable is public, this only happens with the FormFile. All the struts stuff is in my classpath as is commons-fileupload-1.0.jar.

Anyone got any idea what the hell I'm doing wrong ... I'm starting to suspect this could be a struts bug cause everything looks straightforward enough.

--B

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struts file upload strange error

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