In Java 1.4, I am attempting to map a class in our legacy code base that does not have an id attribute to a table in our database that has an auto-incrementing id column. Is there any way to do this without actually adding the id attribute to the class file?

fyi: hibernate can handle auto-incrementing ids that are generated by the database.

but, to answer your question, no I don't think so. How would hibernate differentiate between unique objects.