How can i handle multi user transaction in jboss with j2ee.
as an example,
if 2 users view same record at same time.And one user update the record. then if other user try to update the record server should rais an exception or there should be any other way to detect it.

i tried to do with timestamp, but it was unsuccessful since ejbStore is called every time even after for a viewing a record
pls help me with this.