Cannot convert class org.primefaces.model.file.UploadedFilesWrapper to interface org.primefaces.model.file.UploadedFile - jsf

Question

I'm trying to upload files via primefaces 10.0.. I got the below error msg :
"Cannot convert org.primefaces.model.file.UploadedFilesWrapper#7200b7ba of type class org.primefaces.model.file.UploadedFilesWrapper to interface org.primefaces.model.file.UploadedFile"
code as below :
XHTML:
<h:form enctype="multipart/form-data">
<p:fileUpload uploadLabel="aa" cancelLabel="aa" value="#{managedBean.fileToUpload}"
mode="simple" skinSimple="true" multiple="true" />
<p:commandButton action="#{managedBean.uploadFileDone()}" value="upload" />
</h:form>
ManagedBean:
public void uploadFileDone(){
System.out.println(fileDetailActivite);
this.upload(fileDetailActivite,"Activite_"+activite.getId()+".pdf");
}
public void upload(UploadedFile file,String type) {
if (file != null) {
// System.out.println("FileUploadEvent");
String path = "C:\\tmp\\";
File dir = new File (path);
dir.mkdirs();
FacesMessage msg = new FacesMessage("Success! ", file.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
// Do what you want with the file
try {
InputStream
inputStream = file.getInputStream();
copyFile(file.getFileName(), inputStream,type);
} catch (IOException e) {
e.printStackTrace();
}
FacesMessage message = new FacesMessage("Successful", file.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, message);
}
}
public void copyFile(String fileName, InputStream in,String type) {
// System.out.println("copyFile");
try {
// write the inputStream to a FileOutputStream
fileName=" ";
// OutputStream out = new FileOutputStream(new File(destination + type+"_"+fileName));
OutputStream out = new FileOutputStream(new File(destination +type+""+fileName));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = in.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
in.close();
out.flush();
out.close();
System.out.println("New file created!");
} catch (IOException e) {
System.out.println(e.getMessage());
}
}

Answer 1

When using multiple="true", you need a UploadedFiles property instead of a UploadedFile property so that it can hold multiple files instead of only one.
private UploadedFiles files;
<p:fileUpload value="#{bean.files}" multiple="true" />
Or, if that was not your intent, then you need to remove the multiple="true" attribute.
private UploadedFile file;
<p:fileUpload value="#{bean.file}" />