Error with getString() method in

[trivektor]

I was writing a code to save and get the content of users uploaded file:

//Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();

//Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

//Parse the request
List items = upload.parseRequest(arg0);

//Retreive the file just uploaded
Iterator itr = items.iterator();
FileItem item = (FileItem) itr.next();

File saveTo = new File("E:\\CDLG_Files\\UserUploadedSpreadsheets\\" + System.currentTimeMillis() + ".txt");

try {
item.write(saveTo);
System.out.println("User's spreadsheet saved successfully");
System.out.println("Processing uploaded data");
}
catch (Exception e) {
System.out.println("Error saving user's uploaded file(s)");
}

String output = item.getString();

and I then when I ran the code, the uploaded file was save fine but I got a null pointer exception at the getString(). I wonder if anyone knows why this exception occurs? Below is the strack trace:

[11/14/08 9:34:27:120 EST] 00000036 SystemErr R java.lang.NullPointerException
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at java.lang.String.<init>(String.java:261)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at org.apache.commons.fileupload.disk.DiskFileItem.ge tString(DiskFileItem.java:350)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.cdlabelgenerator.servlets.CreateMultipleLa bels.processDataUpload(CreateMultipleLabels.java:2 11)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.cdlabelgenerator.servlets.CreateMultipleLa bels.processRequest(CreateMultipleLabels.java:84)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.cdlabelgenerator.servlets.CreateMultipleLa bels.doPost(CreateMultipleLabels.java:52)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet .java:763)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet .java:856)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java:989)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapper.han dleRequest(ServletWrapper.java:501)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.h andleRequest(ServletWrapper.java:464)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.webcontainer.servlet.CacheServletWrappe r.handleRequest(CacheServletWrapper.java:90)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.webcontainer.WebContainer.handleRequest (WebContainer.java:744)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.wswebcontainer.WebContainer.handleReque st(WebContainer.java:1433)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at com.ibm.ws.webcontainer.channel.WCChannelLink.read y(WCChannelLink.java:100)
[11/14/08 9:34:27:120 EST] 00000036 SystemErr R at