in src/main/java/org/apache/sling/jcr/jackrabbit/base/security/MultiplexingAuthorizableAction.java [70:75]
public void onCreate(User user, String password, Session session) throws RepositoryException {
log.debug("Created user {}", user.getID());
for(AuthorizableAction a : getActions()){
a.onCreate(user,password,session);
}
}