Catalin Florea 10/01/2020: 

VM Dynamic Attach utility which allows capturing threaddumps, heapdumps and jvm info from command line. 

The utility to send commands to remote JVM via Dynamic Attach mechanism.

All-in-one jmap + jstack + jcmd + jinfo functionality in a single tiny program.
No installed JDK required, works with just JRE. Supports Linux containers and Docker also.

This is the lightweight native version of HotSpot Attach API
https://docs.oracle.com/javase/8/docs/jdk/api/attach/spec/

Supported commands:

	load : load agent library
	properties : print system properties
	agentProperties : print agent properties
	datadump : show heap and thread summary
	threaddump : dump all stack traces (like jstack)
	dumpheap : dump heap (like jmap)
	inspectheap : heap histogram (like jmap -histo)
	setflag : modify manageable VM flag
	printflag : print VM flag
	
Examples of usage:

Load JVMTI agent
$ jattach <pid> load <.so-path> { true | false } [ options ]

List available jcmd commands
$ jattach <pid> jcmd "help -all"

Capture a heapdump for PID 17628 on Windows:
D:\kit\jattach>jattach.exe 17628 dumpheap d:\kit\ABSSolute_9.04.00.hprof

More here:  
https://github.com/apangin/jattach
https://dev.to/jarekprzygodzki/generating-jvm-memory-dumps-from-jre-h8c