Docker went through an era of thinking they could built multitenant systems that amortized the cost of resources across customers. Java went through an era of thinking they could build multitenant VMs that amortized resources across customers. Unix went through an era of thinking they could build multitenant processes that amortized resources across customers. As did Windows.

I point out that Docker is trying - and failing - to offer us the same feature set we were promised by protected memory, preemptive multitasking operating systems 30 years ago. I'm still waiting. I don't recall if there were old farts complaining about this in the early 90's, but I suspect they exist.

Also Java had a bunch of facilities for protection and permissions that I've not heard anyone claim exist in V8. Not that feature equality is required (in fact that may seal your doom), but I don't see feature parity either.

edit: some of facilities Java investigated do exist in cgroups, so one might argue that there is a union of v8 and cgroups that is a superset of Java, but unless I am very mistaken, isolates don't work that way, so isolates are still not the way forward there.