I get unwanted duplicate lines when editing the data content of my JTable

Question

I have created an editable JTable (filled with data from an SQL) with a modified instance of AbstractDataModel.
I have a phenomenon that I cannot explain nor fix: each time I edit a data field in the JTable and press ENTER or leave the field, the edited line is duplicated. The extra content is not sent to my SQL (if I recreate the table everything is fine, except that certainly the changed value is lost). The problem must come from the Java code.
Ok, I admit, that I am not a Java pro and might have made a really stupid error, but I cannot find it.
Has someone already seen such a behavior?
Thanks
CCH
Message was edited by:
CCHuser

Answer 1

Now we are drifting away a little from Java and start getting into philosophy ... :-) But one last reply I will do:
I agree that just playing around with the fuse box is dangerous and brings no benefit. But I am not that unknowing in Java... Technically saying I work in IT, but just not as a programmer but rather as a business consultant (I write the functional concepts that later the programmers have to implement and then I have to talk to them to fix functional errors and do the testing). Besides, I hold an official Java Programmer degree. But when not programming professionally and continuously gaining experience, it is very hard to keep your skill up. Therefore I do one or another hobby project with Java that I could also do better and faster with other tools such as Excel, Access or a simple batch job.
My concept for trying new things is to get a piece of code from the internet from which I assume I know roughly what it does. Then I use it in my programs, and while altering it to my needs, I continuously keep searching in API, documentation and tutorials or simple trial and error to get better insight into the details.
And as a scientist you know what I mean when I say that if I try something new, I simply accept for certain details that they work without knowing how. And over time I then take the time for the "how". Many famous people made their inventions by trial and error and while then testing their new observation and changing the surrounding conditions found out why they work. Not that I would claim for myself to be anything close to a genius inventor but I found that the approach works for me to advance in my insights of a solution.
Sincerely CCH
Message was edited by:
CCHuser