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POSpring upload form optional with optional file
 

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    <p>We are creating a profile page with a form that optionally has a profile pic on it. We are using Spring 3.2 </p> <p>Here is the form: -</p> <pre><code>&lt;form:form id="editMember" modelAttribute="memberAjaxEditModel" method="POST" class="form-horizontal" enctype="multipart/form-data" &gt; ... &lt;form:input path="fileData" type="file"/&gt; ... &lt;/form&gt; </code></pre> <p>Here is the controller method: -</p> <pre><code>@RequestMapping(value = "/{id}", method = RequestMethod.POST) public String onEditPost(@PathVariable long id, @Valid @ModelAttribute(MemberAjaxEditModel.KEY) MemberAjaxEditModel model, BindingResult result) throws ServiceRecoverableException { .... } </code></pre> <p>Here is the Model</p> <pre><code>public class MemberAjaxEditModel { ... private CommonsMultipartFile fileData; ... } </code></pre> <p>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.</p> <p>Here is the error: -</p> <pre><code>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] </code></pre>
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