I've been using the Environment Dashboard plug-in for quite a while now... I believe someone updated other plug-ins or changed the configuration, or even accidentally deleted the h2 DB. Ever since then I can't get the environment dashboard to work.
When I try creating a new dashboard, I get:
javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.jenkinsci.plugins.environmentdashboard.EnvDashboardView
I tried removing and re-adding the plug-in a few times, including manually. I also tried extracting classes.jar but no luck. Any ideas?