File upload issue with Struts 2.1.6 (uploaded file is always null in action)

[hisameer]

I am having trouble with uploading the file using struts 2.1.6. I have to
upload a picture(.jpg, .bmp,.jpeg,.png,.gif) for one of the business
requirement. The application server is JBOSS 5.1.The uploaded file is always
null in my action class:

I followed exactly the same way mentioned in this 
http://struts.apache.org/2.x/docs/file-upload.html link  for the proof of
concept, Here is my code:

jsp code:
<%@ taglib prefix="s" uri="/struts-tags" %>
<s:form action="doUpload" method="post" enctype="multipart/form-data">
    <s:file name="upload" label="File"/>
    <s:submit/>
</s:form>

struts.xml code:
<constant name="struts.multipart.saveDir"
value="C:/Temporary_image_location" />
        <constant name="struts.multipart.maxSize" value="3251468" />

<action name="doUpload" class="com.jctaylor.breg.action.FileUploadAction"
                        method="uploadFile">
                        <interceptor-ref name="basicStack" />
                        <interceptor-ref name="fileUpload">
                                
image/jpeg,image/gif,image/png,image/bmp,image.jpg
                        </interceptor-ref>
                        <interceptor-ref name="validation" />
                        <interceptor-ref name="workflow" />
                        <result
name="input">/jctaylor/pages/insuranceApplication/fileUploadExample.jsp
                        </result>
                        <result
name="success">/jctaylor/pages/insuranceApplication/fileUploadExample.jsp
                        </result>
                        <result
name="error">/jctaylor/pages/insuranceApplication/fileUploadExample.jsp
                        </result>
                </action>

ActionClass code:
public String uploadFile() throws Exception {
                System.out.println("In  the file upload file method");
                File uploadedContent=getUpload(); 
                String imageName="C:/test_folder/images/image.jpg";
                File copyFile=new File(imageName);
                FileUtils.copyFile(uploadedContent, copyFile);
                return SUCCESS;
           }
public void setUpload(File file) {
                this.file = file;
        }
public void setUploadContentType(String contentType) {
                this.contentType = contentType;
        }
public void setUploadFileName(String filename) {
                this.fileName = filename;
        }

I am trying it since last week and always getting the file as null so it
means that struts2 upload is not working or there is something wrong the way
I am doing it. 

Please help! I would really appreciate any kind of help in this regard.


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