NullPointException while uploading file in spring - spring

Question

I try to upload a .csv file's data into database, but when i upload and submit it, it throws nullpointexception. Means, when I print name in controller, name is printed, but when i try to get the file, it show null.
FileUpload model class
public class FileUpload {
private CommonsMultipartFile[] files;
private String name;
// Getters and setters
}
Controller
#RequestMapping(value = "uploadPage", method = RequestMethod.GET)
public ModelAndView uploadPage() {
ModelAndView model = new ModelAndView("upload_page");
FileUpload formUpload = new FileUpload();
model.addObject("formUpload", formUpload);
return model;
}
#RequestMapping(value = "/doUpload", method = RequestMethod.POST)
public String doUpload(#ModelAttribute("formUpload") FileUpload fileUpload, BindingResult result) throws IOException, JAXBException {
System.out.println("myfirl "+fileUpload.getFiles()); // output is null
System.out.println("name "+fileUpload.getName()); // name is displaying
//other stuffs
}
upload_page
<spring:url value="/doUpload" var="doUploadURL"/>
<form:form method="post" modelAttribute="formUpload" action="${doUploadURL }" enctype="multipart/form-data">
<form:input path="files" type="file" multiple="multiple"/>
<form:input path="name" type="text"/>
<button type="submit">Upload</button>
</form:form>
WebConfig
#Bean(name="multipartResolver")
public CommonsMultipartResolver getResolver(){
CommonsMultipartResolver commonsMultipartResolver=new CommonsMultipartResolver();
commonsMultipartResolver.setMaxUploadSizePerFile(20*1024*1024);
return commonsMultipartResolver;
}
I tried to sort it out in many ways, but failed. Anyone try to sort it out? Thanks in advance

Answer 1

#RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
#ResponseBody
public String uploadFileHandler(#RequestParam("file") MultipartFile file) {
if (!file.isEmpty()) {
System.out.println(file.getName);
}
}
or you can do that
#RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public String uploadFileHandler(MultipartHttpServletRequest request) {
Iterator<String> itr = request.getFileNames();
while (itr.hasNext()){
System.out.println(itr.next().toString());
}
....
}