pdf - How to resolve problems with Insufficient length on init xfdf -

i have problems xfdf class init. code works excellent in preproduct , on local machine. doesn't work in product env.

xfdfreader reader = new xfdfreader(getpostdataarray(request));  java.io.ioexception: insufficient length.at com.lowagie.text.xml.simpleparser.simplexmlparser.parse(unknown source) @ com.lowagie.text.pdf.xfdfreader. <mit> (unknown source)