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The Identity part of jBPM is most likely to be a demo of real word 'User Manager'. If you want to use jBPM in your project, maybe you should implement a IdentitySession by yourself and put it into the jbpm.cfg.xml. You can find more information in the developers guide.
You can use your IdentitySession to read the user information from the existed User Manager System, and jBPM can use these information directly.