hello, i have the following problem :

i have a tree, that lists my DB to my gui.

there arte categorys and contacts for example.

once i click on a button "new" when a category is selected in the tree, i can enter values for a new contact.

a new contact object is created and an ID generated for it ( i use Integer id's i generate by a sequence table )

then i say session.save(myContactToSave) and all is fine, it works.

but when i click on an existing contact - lets say with an id 1 - it shows me the selected contact in my form, fine.

after that i click on a category and again do the "new" button and create a new contact object.

the id generated for this new contact is 3 and i say session.save (myContactToSave) but this time i get an exception, saying identifier of an instance of Contact altered from 1 to 3.

iam confused, why it dont works when there was a existing contact selected before ?
somehow hibernate thinks i want to save the former selected contact with a new ID and values, but it is a new one......

help !!

thx

Do you reuse some old object instance? You are not generating those ids yourself are you?

i do. i generate em myself. and no, i dont use some old reference ( as far as i know from debugging lol )

public void saveContactOnly(Contact pContact, Category pCategory) {
log.debug("entering DB-Save................");

try {
mContact = pContact;
log.debug("kontakt der jetzt gespeichert wird = " + mContact);
mCategory = pCategory;

//setze CategoryID f

Look at the Log. I really suspect you are reusing some old objects incidentially. You should also ponder if your session lifecycle is not to long ...