Is it still safe and stable to install Oracle jdk via:
sudo add-apt-repository ppa:webupd8team/java?
Or is it best practice to install Oracle jdk via:
Official Oracle jdk8 download page and extract?
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I will always be safer to install directly from those who developed the software in question.
That being said, I guarantee almost everybody that install Oracle's JDK and JRE uses this repository you mentioned. Became almost like an official repository for Oracle's JDK/JRE.
I tend to go with downloading stuff, compiling and installing myself. That way I can keep good track of things the way I like and modify them. This is somewhat what I like to call, in this day and age, the 'lack of gears' somewhere between my brain cells..