[jboss-user] [JBoss jBPM] - process variable persistance

[aspider]

I define several process variable in process
I found that if variable type is String value, the persistance in table jbpm_variableinstance  is OK , I can read their value from the way as below codes.
 if variable type is other types, such as Boolean/List, the result is always null.

Boolean type is in table jbpm_variableinstance is S type, same as String type variable, having T/F value.
While List type is B type in table, having null value.

Whats the problem? And how to save this kind of process varible.
Thanks a lot. 

 
  | ProcessInstance pi = jbpmContext.getProcessInstance(new Long("xxxx"));
  | String originator = (String)pi.getContextInstance().getVariable("originator");
  | BooleanisDelegated = (Boolean)pi.getContextInstance().getVariable("isDelegated");
  | List delegators = (List)pi.getContextInstance().getVariable("delegators");
  | 



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