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I am using spring MVC 3. I have been trying to access the attributes of the uploaded file but I keep getting the following error message. I can access the other fields of the form that is posted but I can't access the uploaded file.
nullhandleForm - Failed to convert property value of type 'java.lang.String' to required type
'org.springframework.web.multipart.commons.CommonsMultipartFile' for property 'file';
nested exception is java.lang.IllegalStateException:
Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]
for property 'file': no matching editors or conversion strategy found
HTML/JSP file
<%@page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<p>${Response}</p>
<h1>Upload Songs</h1>
<table>
<form:form action="" commandName="handleForm">
<tr>
<td>Song Name :</td>
<td><form:input path="songName"/></td>
</tr>
<tr>
<td>Artist Name :</td>
<td><form:input path="artistName"/></td>
</tr>
<tr>
<td>Gendre :</td>
<td><form:input path="gendre"/></td>
</tr>
<tr>
<td>description :</td>
<td><form:textarea path="description"/></td>
</tr>
<tr>
<td>Browse File :</td>
<td><form:input type="file" path="file" /></td>
</tr>
<tr>
<td colspan="2" style="text-align: center"><input type="submit" value="submit" /></td>
</tr>
</form:form>
</table>
</body>
The form handlerclass
public class HandleForm {
private String songName;
private String artistName;
private String gendre;
private String description;
private CommonsMultipartFile file;
public CommonsMultipartFile getFile() {
return file;
}
public void setFile(CommonsMultipartFile file) {
this.file = file;
}
public String getArtistName() {
return artistName;
}
public void setArtistName(String artistName) {
this.artistName = artistName;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getGendre() {
return gendre;
}
public void setGendre(String gendre) {
this.gendre = gendre;
}
public String getSongName() {
return songName;
}
public void setSongName(String songName) {
this.songName = songName;
}
}
The controller
@Controller
public class AdminController{
@RequestMapping(value = "/admin", method = RequestMethod.GET)
public String showAdmin(){
return "admin/index";
}
@RequestMapping(value = "/admin/upload-songs", method = RequestMethod.GET)
public String showContacts(Model model) {
model.addAttribute(new HandleForm());
return "/admin/upload";
}
@RequestMapping(value = "/admin/upload-songs", method = RequestMethod.POST)
public String doForm(@ModelAttribute(value = "handleForm") HandleForm handleForm, BindingResult result, Model model){
if(result.hasErrors()){
String stringList = null;
List<FieldError> errors = result.getFieldErrors();
for (FieldError error : errors ) {
stringList += error.getObjectName() + " - " + error.getDefaultMessage() + "\n";
}
model.addAttribute("Response", stringList);
//model.addAttribute("songname", handleForm.getSongName()); works fine
//model.addAttribute("filename", handleForm.getFile().getOriginalFilename()); throws an error..?
}
return "/admin/upload";
}
}
Any help would be much appreciated. Thanks in advance
533
A new attribute "maxSwallowSize" is the key to deal this situation. It should happen when you upload a file which is larger than 2M. Because the 2M is the default value of this new attribute .
NullPointerException is thrown when program attempts to use an object reference that has the null value. These can be: Invoking a method from a null object. Accessing or modifying a null object's field.
Interface MultipartResolver. A strategy interface for multipart file upload resolution in accordance with RFC 1867. Implementations are typically usable both within an application context and standalone.
do you need to add the enctype to the form declaration?
enctype="multipart/form-data"
Also make sure you have the resolver for Multipart file in your dispatcher servlet
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- one of the properties available; the maximum file size in bytes -->
<property name="maxUploadSize" value="100000"/>
</bean>
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