By reza_rahman on Apr 02, 2013
The DAO (aka Repository in Domain-Driven Design parlance) is a pervasive design pattern in server-side applications today. If you have a very large number of DAOs that are fairly homogenous/CRUD based, it can be very useful to have a generic version that you can then subclass as needed. German author and celebrated Java EE advocate Adam Bien actually took the time to create generic JPA based DAO code and generously share it with us all.
I encourage you to take a look and discuss the code, preferably with Adam (or here if you wish). If you are the open source hacker sort, you could even consider giving the code more airtime by adding it to a separate project perhaps under something like Apache DeltaSpike.