Even though I highly doubt anyone will answer (based on previous experience, in addition to looking at "unanswered posts"), I'm gonna try anyway... Hibernate's support for calling I/U/D stored procedures is extremely limited. For example, I would like to call a procedure with OUT params and be able to examine them to determine if an error occurred when calling merge/persist/delete. It seems that implementing a custom persister is the way to do it, but extending AbstractEntityPersister requires implementing 29 methods (2 of which are constructors). Hibernate's documentation seems really lacking, outdated, and inconsistent so finding answers feels like pulling teeth. I'm not trying to bash the framework, but I've been finding it real difficult to customize its behavior in seemingly simple ways and am on the verge of just dumping it altogether. Any advice would be much appreciated.