Java JVB CPU Usage

I have a server with 3 CPUs and 4GB RAM on a Ubuntu 18.04 VM.

With a conference running the java process in top is showing around 42% usage, colibri stats is showing 0.8 and VMware is showing 9.7%.

What is the real performance metric here? I dont think i should be seeing 42% usage with just one call.

Also, thoughts on the command that is being shown in htop?