Hibernate version:
Hibernate 3.0

Name and version of the database you are using:
Postgre SQL 8.0

Hi all,
I have some difficulties to design a object structure with hibernate.
I looked for s solution of my pb in the forum but i didn't find it, so I decid to

My problem is :
I have:
a User class
a Doctor class extends User class
a Patient class extends User class

so I use joined tables structure in my DB.
So with hibernate. the simpled hibernate mapping is :

<class name="User" table="user>

<joined-class name="Doctor" table="doctor">
<key column="id">

<patient properties ... />

</joined-class>

<joined-class name="Patient" table="patient">
<key column="id">

<doctor properties ... />
</joined-class>

</class>

The pb is that a doctor can be a patient as well. Doctor and Patient are just some "aspects" or profil of the same user.
so sometime i would like switch to the Doctor Class to the Patient class, but Hibernate did a WrongClassException because for the program, it's either a doctor or a patient, he can be the same object.. I don't known how resolve this problem because Apparently it's not possible to do:
session.get(Doctor.class, id);
and after
session.get(Patient.class, id);
-> wrongClassException


Can you help me please ?

are you sure session.get is throwing the exception? If so, print the stack trace. also, do not be suprised at anything hibernate does if you are using a Session after an exception is thrown. once you get an exception you should close it and throw it away.

also, take a look at those inheritance options that are available that don't use discriminators ...

http://www.hibernate.org/hib_docs/v3/re ... strategies