nt2005 [https://community.jboss.org/people/nt2005] created the discussion "Re: Getting an IOException when trying to use Persistence" To view the discussion, visit: https://community.jboss.org/message/648527#648527 -------------------------------------------------------------- Hey Mauricio, Sorry for the bad question. Okay. I get the same error like above: ]*while* storing workItem 1: de.toni.analysis.MyDataCalculation In my Javafile MyDataCalculation I can implement the Serializable interface and the error dispear for this Class. But I have got much more Classes in Libaries (from work), where I haven´t got the *.java file, only the class files. There I can´t implement the Serializable interface. :( -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/648527#648527] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]