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mapping is all so in the cof file, funny thing -> If I delete the database and create it again the code works for a couple of times then same error

My Hibernate file:


<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
...

Okay now I am going with Hibernate and get this error:


Hibernate: drop table if exists Book
Hibernate: create table Book (id integer not null auto_increment, createdDate datetime, isbn...

Hey I am writing an JSP based web application for maintaing and keep inventory of 2000+ books.
The data will be store persistent in a MySQL or PostgreSQL DB (have not decide yet), and I am use to...