I repeat my question by sample.
1: the end-user "Reza" Login in sytem.
2: He want to insert one object in database.
3: my database  wants to know who wants to insert this
object.
I want to send  this user.As you know, In Application
server we have connection pool and all the connection
assigned by one user  like "developer".
If I implement JAAS in my project I can find the
web-Applicaion user in my application  server, But I
don't know how database can know that user.My
percistence manager is hibernate.