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Boa tarde. Estou seguindo um tutorial de como fazer upload de arquivos usando springframework. http://www.loiane.com/2010/03/tutorial-upload-de-arquivo-com-extjs-e-spring-framework/ em uma classe desse tutorial, eu tenho o seguinte codigo: package com.loiane.web; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.validation.BindException; import org.springframework.web.bind.ServletRequestDataBinder; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.SimpleFormController; import com.loiane.beans.FileUploadBean; public class FileUploadController extends SimpleFormController { protected ModelAndView onSubmit( HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws ServletException, IOException { // cast the bean FileUploadBean bean = (FileUploadBean) command; MultipartFile file = bean.getFile(); String fileName = null; if (file == null) { System.out.println("User Did not upload file"); } else { System.out.println("Uploaded File Name is :" + file.getOriginalFilename()); } InputStream inputStream = null; OutputStream outputStream = null; if (file.getSize() > 0) { inputStream = file.getInputStream(); String root = "C:\\"; fileName = root + file.getOriginalFilename(); outputStream = new FileOutputStream(fileName); int readBytes = 0; byte[] buffer = new byte[10000]; while ((readBytes = inputStream.read(buffer, 0 , 10000))!=-1){ outputStream.write(buffer, 0, readBytes); } outputStream.close(); inputStream.close(); } return null; } protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws ServletException { // to actually be able to convert Multipart instance to byte[] // we have to register a custom editor binder.registerCustomEditor(byte[].class, new ByteArrayMultipartFileEditor()); // now Spring knows how to handle multipart object and convert them } } Ao executar, eu tenho uma msg de erro na linha // cast the bean FileUploadBean bean = (FileUploadBean) command; a msg é a seguinte java.lang.ClassCastException: java.lang.Object cannot be cast to br.com.doutorhouse.FileUploadBean alguém sabe como resolvo isso?