Annotated form and setBindEmptyMultipartFiles

[eggsy84]

Hi all,

I'm hoping a member can help me.

I am using the Spring Framework (in particular their Web MVC annotations) for an application I am working on but I've hit a bit of a snag.

I have an annotated controller which uses a form backing object that contains (amongst other things) a MultipartFile.

When I submit the form if I choose a file and then submit the code works fine. However if I don't choose a file and submit the form I get the following error:

Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.MultipartFile] for property 'imageFile'

This is obviously a binding error. Does anyone know why it would be attempting the bind a string even if the item is empty?

One thing I have tried is to edit the binder by doing the following:

@InitBinder("myObjectCommand")
public void initBinder(WebDataBinder binder)
{
    binder.setBindEmptyMultipartFiles(false);
}

But it seems to still attempt to bind the file?

I've done a search of the forums but cannot seem to find anyone with the same error?

For reference the command object behind my form is like this:

public class CategoryCommand
{
    private MultipartFile imageFile=null;
    /**
     * @return the imageFile
     */
    public MultipartFile getImageFile()
    {
 	return imageFile;
    }

    /**
     * @param imageFile the imageFile to set
     */
    public void setImageFile(MultipartFile imageFile)
    {
        this.imageFile = imageFile;
    }
}

Also as a side note I have tested the functionality with a non annotated controller (so url mappings and definition in the servlet.xml) and this seemed to work fine but I would much rather use annotations? And you guys probably know that when something isn't working it bugs you until you find out why

Any help would be much appreciated?!?

[eggsy84]

Hi all,

Just to let people know this was a client side issue and nothing to do with Spring.

I have been using a jQuery Ajax form plugin that submits my form via Ajax it is this that is making the form element default to a string?!

Problem in chair not in computer - PICNIC