Thanks for your help.Few days ago,I used JBPM 3.2.6 and informix 9.4 to deploy my application.I made 30 Processes start the ProcessInstance at the same time,Then the aplication throw database Deadlock Exceptions.Then I asked the informix technology support,he told me that some sessions operated the JBPM_TOKEN table at the same time and two sessions made the Deadlock error.So I use 4.0version to test whether there are same questions between JBPM3.0 and informix.It's a pity that I'm not success.I'll try again later and thank you again. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244961#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...