We are creating a profile page with a form that optionally has a profile pic on it. We are using Spring 3.2
Here is the form: -
<form:form id="editMember" modelAttribute="memberAjaxEditModel"
method="POST" class="form-horizontal" enctype="multipart/form-data" >
...
<form:input path="fileData" type="file"/>
...
</form>
Here is the controller method: -
@RequestMapping(value = "/{id}", method = RequestMethod.POST)
public String onEditPost(@PathVariable long id, @Valid @ModelAttribute(MemberAjaxEditModel.KEY) MemberAjaxEditModel model, BindingResult result) throws ServiceRecoverableException {
....
}
Here is the Model
public class MemberAjaxEditModel {
...
private CommonsMultipartFile fileData;
...
}
It works fine if a file is submitted on the form, but there are errors in the BindingResult variable if the form is submitted without a file.
Here is the error: -
Field error in object 'memberAjaxEditModel' on field 'fileData': rejected value []; codes [typeMismatch.memberAjaxEditModel.fileData,typeMismatch.fileData,typeMismatch.org.springframework.web.multipart.commons.CommonsMultipartFile,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [memberAjaxEditModel.fileData,fileData]; arguments []; default message [fileData]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile' for property 'fileData'; 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 'fileData': no matching editors or conversion strategy found]
It turns out it was the jQuery Form plugin which was sending an empty string instead of what spring expects - nothing to be sent.
I solved the problem using a before submit to remove the fileData value if it wasn't populated like so: -
function beforeSubmit(arr, $form, options){
var fileDataIndex = -1;
$.each(arr, function(index, value) {
if (value.name == "fileData"){
if (value.value.length == 0){
fileDataIndex = index;
}
}
});
if (fileDataIndex != -1){
arr.remove(fileDataIndex);
}
}
I hope this helps some googlers with the same problem.
See also github issue 296:
You can use the iframe option to force the same type of post for both cases:
iframe: true
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