I just got the notice from Customer Service regarding the newly available Workbench as an Eclipse plugin. The Wolfram instructions say to install JDK8 and Eclipse Neon before installing the plugin.
I get to the point of installing Eclipse and the installer offers a lot of options. My guess is that I should install “Eclipse IDE for Java Developers” or “Eclipse IDE for Java and Report Developers.” But I hate guessing.
I did not install the top one at first and it was not good. Documentation build failed.
I suggest you install the top one, “for Java Developers”. Certain Java tools, such as Ant, are required for some parts of the Workbench to work and aren’t included in all types of Eclipse (though the support article does say that the JDK, not JRE, is required, so maybe my mistake was not installing the JDK separately).
@Szabolcs Horvat Which one did you install? I never do Java but sometimes I do C/C++, so I installed the third one. I tried with that one and it seems to work (at least the parts that I have used).