[Bug] Better handling missing modules in target JVM

[grzesuav]

Current Behavior

Currently, when jdk.management.jfr module is missing in target VM, :

• very cryptic issue is show on the ui,
• in logs there is a trace like in Cryostat 3.0 usage issues #595 (reply in thread)

Expected Behavior

See notification / popup suggesting what is the actual problem, like missing JFR module

Steps To Reproduce

No response

Environment

- OS:
- Environment:
- Version:

Anything else?

Related discussion - #595 (reply in thread)

[andrewazores]

#595 (reply in thread)

[grzesuav]

Just to put here idea by @andrewazores : possibly check MXBeans present in target vm.

IIRC there are two versions of connection (because of differences in java versions):

• V1 - link - ???
• V2 - link -in this case java.management and java.management.jfr modules are needed, not sure about MXBeans