I'm new to Hibernate and just bought the book. So far I quite like it.

Either there's a strange reverse-way of setting attributes, or there's a typo on page 80, Section 3.3.2, under "Controlling insertion and updates":


Presumably, if it's immutable, you want to set immutable to "true" in the class mapping, right? And while (if) you're editing that line, the sentence needs a period.

Thats an error in the book, it should be mutable="true|false". I remember that I fixed it in the final proofread but it didn't find its way into print.