Null Pointer Exception in Fileupload process of Struts2 - struts2

Question

I am doing fileupload process in Struts2 application. When i display filename and contenttype in action class it showing null pointer exception.
I have included jar files and using the following codes.
In upload.jsp
<s:form action="saveBulkStores.action" method="POST" enctype="multipart/form-data">
<s:actionmessage name="message"/>
<s:label value="File Name : *" />
<s:file name="upload" label="File" size="40"/>
<br>
<br>
<s:submit name="ADD" value="UPLOAD"/>
<input type="button" onClick="cancelFunction()" name="Cancel" value="Cancel" tabindex="10">
</s:form>
In struts.xml
<action name="saveBulkStores" class="com.rewardz.action.FilesUploadAction" method="saveBulkStores">
<interceptor-ref name="fileUpload">
<param name="maximumSize">52428800</param>
</interceptor-ref>
<interceptor-ref name="basicStack"/>
<result name="input">/uploadfile.jsp</result>
<result name="viewFile">/viewfile.jsp</result>
<result name="Reload">/uploadfile.jsp</result>
</action>
In Action class:
private File file;
private String contentType;
private String filename;
public void setUpload(File file) {
this.file = file;
}
public void setUploadContentType(String contentType) {
this.contentType = contentType;
}
public void setUploadFileName(String filename) {
this.filename = filename;
}
public String saveBulkStores() throws IOException{
System.out.println("check Bulk upload file");
String filePath = request.getRealPath("/");
System.out.println("Server path:" + filePath);
System.out.println("UPLOADFILECONTENT TYPE:"+contentType);
System.out.println("UPLOADFILENAME:"+filename);
System.out.println("UPLOADFILE:"+file);
System.out.println("**********************************");
value = "viewFile";
System.out.println("Forward Value:"+value);
return value;
}
Output in Server.log:(Using GlassFish Server)
check Bulk upload file
C:\glassfish3_installer\glassfish\domains\domain1\applications\My_Application\
UPLOADFILECONTENT TYPE:null
UPLOADFILENAME:null
UPLOADFILE:null
So anybody please help me to get the filename,filepath in uploading process of Struts2.

Answer 1

Hi Shiva the problem is with the tag you are using in action class.
<s:file name="upload" label="File" size="40" />
where upload property is not existing in your action class there is a property File file you use file instead of upload so that will solve your problem
<s:file id="file" name="file" />