VisualVM CPU sampling not working

[Alan Bateman]

On 18/05/2017 20:39, Alan Snyder wrote:

> As far as I can tell, the latest VisualVM (1.3.9) is unable to do CPU sampling or profiling on the latest EA build (9-ea+169-jigsaw-nightly-h6406-20170517).
>
> Is this really the case, or am I missing something?
>
> Is someone working on this?
I took a quite look.

As Mandy said in the previous mail, the JMX interop issue between JDK 8 
and JDK 9 is JDK-8167121. This is fixed in jdk8u-dev but hasn't got into 
a released JDK 8 update yet.

So as a test, I ran Visual VM 1.3.9 on a JDK 9 build to attach to an 
application running on the same JDK 9 build. As VisualVM (or maybe the 
NetBeans framework that it builds on) makes use of a number of JDK 
internal APIs. It has encapsulation busting command line options 
configured in etc/visualvm.conf but the module names aren't quite right 
- specifically, jdk.jvmstat was renamed to jdk.internal.jvmstat a couple 
of builds ago. I fixed those and it started up okay. I tried the 
Monitor, Threads, and Sampler tabs and they seem to work okay.

-Alan