Question

I want to cast httpServletRequest to multipartHttpServletRequest. When I try this, a ClassCastException occurs.

MultipartHttpServletRequest request = (MultipartHttpServletRequest)req;

This error occurred only for AJAX call, for form submit it doesn’t happen.

I’ve done all necessary steps as follows:

1. Use commons-fileupload.jar
2. Set enctype="multipart/form-data"
3. Define multiparResolver bean in spring context.

Please help.

Answer 1

Yes, through Ajax you cannot upload file content, so as request not having any file content spring cannot prepare MultipartHttpServletRequest, which causes ClassCastException. Then you have to use technique of using iframe in html to upload file while giving ajax style upload.