Netbeans 8.0.2 won't start after updating - netbeans-8

recently I was able to update Netbeans 8.0.2 by using this guide for changing the update- url:
Netbeans update fail
After changing the url I installed all ( several douzen ) offered updates and restarted the IDE.
Now it shows the start- screen and disappears. That's all.
What may I be supposed to do to make it work again ?
Thanks in advance.

I ended by un- & re-installing the IDE.

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