Accessing remote Spring Boot via JMX with VisualVM

Question

I need to monitor Heap allocation and usage of a Spring Boot remote application using VisualVM. I cannot change the code, but I've seen it done locally, so the configurations in source code must be correct. I need to be able to expose JMX ports. Currently, I have this in the application's configuration

RUN_ARGS="--spring.profiles.active=dev -Dcom.sun.management.jmxremote 
  -Dcom.sun.management.jmxremote.port=<PORT>
  -Dcom.sun.management.jmxremote.authenticate=false 
  -Dcom.sun.management.jmxremote.ssl=false 
  -Dcom.sun.management.jmxremote.rmi.port=<PORT> 
  -Djava.server.hostname=<IP>"

where both instances of <PORT> are the same, and indentation is added for reading purposes only, nonexistent in the file itself. In VisualVM, then, I try creating a Remote and adding a JMX Connection to it. I tried both syntaxes, <hostname>:<port> and service:jmx:<protocol>:<sap>, but none seem to work.

EDIT: I'm doing this inside the RUN_ARGS variable used in Spring Boot's configuration file. I don't know if it needs to be in another variable, such as JAVA_OPTS

EDIT 2: Checking netstat, I found that the port is there as LISTEN... Now I can't connect from my machine. I'm using this https://theholyjava.wordpress.com/2012/09/21/visualvm-monitoring-remote-jvm-over-ssh-jmx-or-not/

EDIT 3: I found I can telnet to the port, but VisualVM still refuses it...

You say to connect remotely. Have you checked that there is no firewall in between, which blocks the ports? — dunni, Feb 09 '18 at 14:12
I think you need to pass just the below in VM arguments: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port= -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false Check the answer for more details - https://stackoverflow.com/questions/856881/how-to-activate-jmx-on-my-jvm-for-access-with-jconsole — Rahul, Feb 09 '18 at 14:49
I am not able to telnet the port, but I already thought so. I am simply unable to expose the ports. Gonna try your solution now. — Patrícia Villela, Feb 09 '18 at 14:59
I tried to do it with java -jar directly, but it didn't work. — Patrícia Villela, Feb 09 '18 at 15:10
Checking netstat, I found that the port is there as LISTEN... Now I can't connect from my machine. I'm using this https://theholyjava.wordpress.com/2012/09/21/visualvm-monitoring-remote-jvm-over-ssh-jmx-or-not/ — Patrícia Villela, Feb 09 '18 at 17:41
I found I can telnet to the port, but VisualVM still refuses it... — Patrícia Villela, Feb 14 '18 at 11:41

Accessing remote Spring Boot via JMX with VisualVM

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