I spent some time on this, so if this can help other people...
Here is the context:
I migrated the application from JBoss AS 7.1.1 to EAP 6.2 and I began to get exceptions like
"org.postgresql.util.PSQLException: ResultSet not positioned properly, perhaps you need to call next"
when EJB "A" called methods from EJB "B".
This happens because EJB "B" runs with principal "anonymous", and the SQL request specified for
DatabaseRoles mapping returns no record in this case: https://issues.jboss.org/browse/SECURITY-639
(I don't have any user called "anonymous" in the database).
It seems that EAP 6.2 (and 6.1 too) now applies the role mapping configuration in this kind of
situation whereas it was not the case before. As a workaround, I created a fake "anonymous" user
with a fake role in the database, but this is a bit ugly. If someone has a better way to handle this...
Retrieving data ...