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Hibernate insert or select gives "Identifier of an instance altered"

 
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I'm new to Hibernate and just trying to get the quickstart up and running that is in the first chapter of the hibernate tutorial. I'm using Hibernate 3.0.5. When running the following code in my servlet:



I get the following error:

org.hibernate.HibernateException: identifier of an instance of org.hibernate.examples.quickstart.Cat altered from 1 to null

Here is the hibernate.cfg.xml and cat.hbm.xml:



I am using MySQL database 4.1.12a with the MySql connector 3.1.10 on Windows XP. My script to create the table in Mysql is:

create table cat (
cat_id varchar(32) not null,
name varchar(16) not null,
sex char(1) not null,
weight float(2),
primary key (cat_id)
);

What is causing this error? Any help is greatly appreciated!
Thanks
Brian
 
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Can you post the detail hibernate log
 
Brian Nice
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The problem was in my persistent class, I had typed the set field incorrectly. Doh!

private Long id;
public void setId(Long Id) {
this.id = id;
}

Thanks
Brian
 
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