I am fairly new to hibernate. Here I have a database table which includes zip code info and does not have an id column. (This is a third party database table which we used in our application). I am using xdoclet to generate mapping files. So I created POJO class which represents this table structure. Then I tried to compile this using xdoclet and I am getting following exception

[hibernatedoclet] xdoclet.XDocletException: Class com.abc.model.ZipInfo misses ID property

Can we define a class with out a id field? Can you please explain the reason for this?

Thanks
prasanna

Make a composite key and include every column as part of the composite key.