Hi There,
Yes is possible to integrate jBPM5 with LDAP. Right now jBPM5 keeps only a reference to the external users inside the Human Task Server.
The idea of keeping only the ID is to be able to integrate jBPM5 with any identity component. jBPM5 will work only with the IDs (just a string) and you as integrator will need to do the mappings with your exteranl identity component.
Greetings