Hi friends,
I have a problem in updating a row that has no primary key.But I need to map one property as a primary key in my class which is mapped to that table other wise I get an error while generating mapping file (by running ant).
Now there is no problem while saving, but when I try to update it throws exception.
Are there any alternative ways to solve it?

You could map all attributes as a composite-key. Please remember that your database is broken, if you don't have a primary key declaration for a table. Better clean it up.