State of Eclipse IDE for openHAB development?

My Eclipse development environment is broken, and I can’t figure out what has happened, or what to do about it. It seems to have recently upgraded itself to Neon, and appeared to work well enough for a few days, but now it’s failing with

Errors occurred during the build.
Errors running builder 'Plug-in Manifest Builder' on project 'org.eclipse.smarthome.binding.digitalstrom'.
java.lang.NullPointerException
Errors running builder 'Plug-in Manifest Builder' on project 'org.eclipse.smarthome.binding.fsinternetradio'.
java.lang.NullPointerException
...

Which leads to countless errors of course.

And upon trying to just reinstall the whole thing, the first step in the IDE setup instructions – download the Eclipse installer – leads to this:

Is there anything that I can do individually, or that we can do collectively, to yield a stable, reliable development environment that doesn’t upgrade itself without asking, doesn’t break itself, that allows us to reinstall it from a known working starting point, etc.? Have developers just gotten used to the situation where the IDE becomes an ongoing issue in itself? I suppose it’s at least worth more than the price I paid, but still…

Thank you,
John

I was really surprised last Saturday when I restarted Eclipse to discover that Eclipse.Neon had been installed without asking me anything.
I think it was just to reformat a source code so I have not done a lot of tests.

Once the Eclipse installer was again available, I performed a complete re-install and that sorted out the problem. Thanks for replying.