This page documents the architecture, targetted features, related discussions and jira issues with respect to Activiti's integration to Spring Security
The idea is that an implementation of the IdentitySession will be created that binds to Spring Security. It would be great if this is tested also with LDAP.
http://forums.activiti.org/en/viewtopic.php?f=4&t=280
http://jira.codehaus.org/browse/ACT-116