When you try to install something from Central as soon as JBDS starts for the first time, you can get errors.
I can reproduce some sort of errors every time (I tried 4 or 5 times), but only on a completely fresh install of JBDS/JBT (no central repo data cached).

It looks like there is a race condition.

Several times when I tried to install Findbugs, I got:

The following connectors are not available: FindBugs
Proceed with the installation anyways?

Followed by the Computing connector errors with NPEs familiar from JBIDE-17471

If I proceed anyway, the install dialog is empty.

If I click that I don't want to install, I get this:

Problems occurred while performing installation: The following connectors are not available: FindBugs (id=edu.umd.cs.findbugs.plugin.eclipse.feature.group, site=https://devstudio.jboss.com/updates/8.0-staging/central/core/)
The following connectors are not available: FindBugs (id=edu.umd.cs.findbugs.plugin.eclipse.feature.group, site=https://devstudio.jboss.com/updates/8.0-staging/central/core/)