I did some research and i figured (not sure..) that jbpm uses the FileDefinition object to load the class byte array from the a database, and then with a specialize class, subclass of ClassLoader, loads the class from the byte array. But i still don't know where the binary class data is stored, i checked out the jbpm database and there is nothing stored besides the jbpm_byte_block table that is used to stored some object variables or something like that. Also i cheked the size of jbpm/server folder and when i do the deploy the size doesn't change, so i guess it's not using some embeded database. Any suggestion / comment / whatever... ?? Thanks, View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4116562#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...