oreilly MultipartRequest Throwing exception whil uploading file

I am trying to upload files to my server using oriellys MultipartRequest.

I seem to get the following exception at random times

[2008-03-17 12:59:13,656] java.io.IOException: unexpected end of part
at com.oreilly.servlet.multipart.PartInputStream.fill(PartInputStream.java:100)
at com.oreilly.servlet.multipart.PartInputStream.read(PartInputStream.java:183)
at com.oreilly.servlet.multipart.PartInputStream.read(PartInputStream.java:156)
at com.oreilly.servlet.multipart.FilePart.write(FilePart.java:208)
at com.oreilly.servlet.multipart.FilePart.writeTo(FilePart.java:167)
at com.oreilly.servlet.MultipartRequest.(MultipartRequest.java:266)

The code that causes this error is
MultipartRequest mReq;
            try {
                  mReq = new MultipartRequest(request, FileUtil.getSharedTmpDir().toString(),
                        MAX_FILE_BYTE_SIZE, Encoding.STRING_ENCODING, RENAMER);
}

The real problem is that, the upload works sometimes and sometimes throws this error. It seem to throw error more often when I upload large files(>100K) but not always. It seems browser specific some times( works mostly in IE) fails mostly with Firefox.. but not consistent.

I am using Tomcat6.0 (standalone)
AJP13

some more information about how I send this request.
I send this request through ajax call in javascript . See code snipper




I googled about this issue and found that its a AJP13 bug. I am not able to find how to fix this.
Any suggestion or help is greatly appreciated. Start Free Trial

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var theDiv = document.createElement('div');
    theDiv.style.display = 'none';
    theDiv.innerHTML ='<iframe id="hidden_frame" name="hidden_frame" src=""></iframe>' +
    '<form id="hidden_form" target="hidden_frame" action="../servlet/Ajax?cmd=fileUpload" enctype="multipart/form-data" method="post"></form>';
 
    document.body.appendChild(theDiv);
    var hiddenForm = document.getElementById("hidden_form");
    fileParent.removeChild(theFile);
 
    // attach the file to the hidden form  and submit 
    hiddenForm.appendChild(theFile);
    hiddenForm.submit();
    rbf_callServer();
    hiddenForm.removeChild(theFile);
 
 
callServer()
{
m_ajaxRreq = getXMLHTTPRequest();
 	if (m_ajaxRreq) {
 		var url = getAjaxURL()+'&cmd=uploadStatus';	
 		
 		//create an local copy of the request to handle response in case of multiple requests
 		m_ajaxRreq.onreadystatechange = function () { doUpload(m_ajaxRreq); }
 		m_ajaxRreq.open("GET", url, true);		
 		m_ajaxRreq.send(null);
}
 
}