i just run example: Evaluation.bpmn
{ActorId=javax.activation.DataHandler@443d7f, Comment=Please perform a self-evalutation., Skippable=false, Content={reason=javax.activation.DataHandler@89cd90},2013/9/19 TaskName=Performance Evaluation}
ActorId is also a javax.activation.DataHandler, but it has bean writeObject success
when writeObject content ,throws Exception.