The setting ExpressionAssignmentHandler is read only on the time of proccess 
being deployed. So we have two options to work arround this problem. The first 
is modifing the JpdlXmlReader soruce file, replace 
"org.jbpm.identity.assignment.ExpressionAssignmentHandler" with your 
implemented class name, then rebuild the jbpm-XXX.jar. The most important step 
is to re-install the process designer in Eclipse so that when you depoly a 
process, your ExpressionAssignmentHandler class name will be saved into the 
table JBPM_DELEGATION. The other approach is more simple: issue the following 
SQL updat statement after deployment: update JBPM_DELEGATION set CLASSNAME_ = 
'FULL_CLASSE_NAME_OF_YOUR_EXPRESSION_HANDLER'

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