Huisheng Xu [http://community.jboss.org/people/rebody] replied to the discussion "JBPM4.3 Variable History" To view the discussion, visit: http://community.jboss.org/message/535974#535974 -------------------------------------------------------------- Hi Khaled,   I am so sorry for my mistake.   There is a bug in ExecutionImpl.createVariable(), it will always throw a NullPointerException because of not checking the unsaved history variable. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/535974#535974] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]