in the ExportDataUtil I used FileOutputStream to create related files on the disk. Does this make the problem? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085351#4085351 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4085351