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TECH TIP : How to proactively monitor heap space usage of JAVA based probes 

Oct 31, 2017 11:28 PM

JMX interface allow us to access heap space metric.

It is possible to enable JMX (in JAVA probes) with additional Java parameters.

The approach remain probe independent while section required to modify is probe dependent.

Here is an example for vmware probe.

1. Open vmware probe via Raw Configure, and find Java startup parameter section.
In the vmware probe, the following configuration key can be found in the (startup) section.

-Xms(XX)m -Xmx(YY)m

2. Append JMX parameters to enable JMX. The whole setting should look like this in this example.

-Xms(XX)m -Xmx(YY)m -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.port=9050 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

3. Restart the probe. The specified port (9050 in this example) come accessible.

4. You are able to monitor Java resources using third party tool (like JDK Jconsole).

Here is steps if you want to use UIM probe - jvm_monitor

[Resource Name] Any value
[Hostname or IP Address] IP Address / Hostname
[Port] JMX port (specified with -Dcom.sun.management.jmxremote.port)
as below example it's 9050

No username / password required.

5. Save to make it work.

6. Go back to jvm_monitor GUI and select the added resource in left pane.
Then select the required monitor item. Select as ResoureName > java.lang > memory > name > HeapMemoryUsage
check committed and set the threshold for it.

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Jan 23, 2020 06:40 PM

Hi, If my probe is installed on the same machine where my JVM are, is it mandatory to start the app with the JMX arguments ? 
From what i can read, with Jconsole you don't need that parameter to detect all the available JVM to monitor...

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