I am a newbie in java. I am having problems in installing windowbuilder. It said:
windowbuilder was not able to show GUI & Version 4.6 is not present
in[3.7,3.8,4.2,4.3,4.4,4.5]
You should try to re-install eclipse. I do use window builder with Eclipse neon, and i didn't get problems with the instalation.
Greatings.