JVM Monitoring

deepb

Hi,

I'm new to NetXMS and want to monitor JVM as given in JVM monitoring — NetXMS Administrator Guide (4.4.3).

I have created new DCI parameter as below:

Parameter : JMX.Memory.Heap.Current({instance})
Instance Discovery Method : Agent List

What should be the List name? Is any filtering script required? Please help!

Victor Kirhenshtein

Hi,

this (and other) metrics requires JMX server name as an argument. You define JMX servers in agent configuration file (see https://www.netxms.org/documentation/adminguide/jvm-monitoring.html#configuration) Unfortunately, there is no agent list to return all configured JMX servers on that particular agent (we can add one in next release). So for now you cannot use instance discovery if you have multiple JMX servers monitored by one agent.

Best regards,
Victor

deepb

Hi,

So, in agent configuration file, under [JMX] if I define Server=servername:login/password@url, then Parameter becomes JMX.Memory.Heap.Current(servername), right? And if I'm connecting to local Wildfly JMX then I should write Server=servername:wildfly/wildfly@localhost:9990. Is this OK? I'm confused about how to mention the port number.
I have tried all 3 formats, none working.
1. name:url
2. name:login@url
3. name:login/password@url
Though I'm able to connect to local Wildfly through JConsole/VisualVM.

Please guide.

Regards,
Deep

Filipp Sudanov

I've use this stackoverflow post: https://stackoverflow.com/questions/5552960/how-to-connect-to-a-java-program-on-localhost-jvm-using-jmx

For test I just use NetXMS management client:

java -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=1234 -Dcom.sun.management.jmxremote.ssl=false -jar ~/Downloads/nxmc-4.4.4-standalone.jar

Agent config has this:

Server=s:service:jmx:rmi:///jndi/rmi://127.0.0.1:1234/jmxrmi

On debug level 6 agent produces the following output in it's log:

2023.12.08 13:09:14.786 *D* [comm.cs.68        ] Requesting metric "JMX.VM.Version(s)"
2023.12.08 13:09:14.917 *D* [                  ] JMX: connected to service:jmx:rmi:///jndi/rmi://127.0.0.1:1234/jmxrmi
2023.12.08 13:09:14.919 *D* [                  ] JMX: reading object java.lang:type=Runtime attribute VmVersion

I have no clue what all these things in the url mean, but hope that helps

Also, here's Oracle docs on the URL: https://docs.oracle.com/javase/8/docs/api/javax/management/remote/JMXServiceURL.html

deepb

I'm using Server = name:service:jmx:remote+http://localhost:9990 as applicable for JBoss EAP 7.1/Wildfly 11

This is throwing, Exception in parameter handler: java.net.MalformedURLException: Unsupported protocol: remote+http

I'm supposed to include jboss-client.jar in the application(netxms agent) classpath. Is it possible in NetXMS agent to include an external jar?

Filipp Sudanov

Java subagent has a few configuration parameters that can be provided in [JAVA] section of agent configuration file. See the code for list of params:
https://github.com/netxms/netxms/blob/master/src/agent/subagents/java/main.cpp#L131

As I understand, you can use "ClassPath" parameter to add your .jar file.

deepb

Added jboss-client.jar using Classpath but that didn't solve the problem. Still getting java.net.MalformedURLException: Unsupported protocol: remote+http

Victor Kirhenshtein

I have found the problem with classpath setting in JMX plugin. Try to replace jmx.jar on your system with this version: https://cloud.radensolutions.com/s/WDCCtmPKHXGZwyo.
If you installed agent on Linux from packages it will be inside /usr/lib/netxms/java.

Best regards,
Victor

deepb

Hi Victor,

The agent is installed on a Windows machine, so I replaced the jmx.jar at \lib\java and now I'm getting the below given error:

2023.12.20 11:01:42.028 *D* [comm.cs.1          ] Requesting metric "JMX.Memory.Heap.Current(name)"
2023.12.20 11:01:42.439 *D* [                   ] JMX: cannot setup connection to service:jmx:remote+http://localhost:9990
2023.12.20 11:01:42.440 *D* [                   ] JMX:   java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.wildfly.common.context.ContextManager.getPrivileged(ContextManager.java:271)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.wildfly.common.context.ContextManager.get(ContextManager.java:242)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remoting3.EndpointImpl.construct(EndpointImpl.java:231)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remoting3.EndpointBuilder.lambda$build$0(EndpointBuilder.java:128)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   java.security.AccessController.doPrivileged(Native Method)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remoting3.EndpointBuilder.build(EndpointBuilder.java:128)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remotingjmx.RemotingConnector.internalRemotingConnect(RemotingConnector.java:204)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remotingjmx.RemotingConnector.internalConnect(RemotingConnector.java:156)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.jboss.remotingjmx.RemotingConnector.connect(RemotingConnector.java:103)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.netxms.agent.jmx.Server.connect(Server.java:95)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.netxms.agent.jmx.Server.getAttributeValue(Server.java:234)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.netxms.agent.jmx.JmxPlugin$JmxObjectParameterAdapter.getValue(JmxPlugin.java:278)
2023.12.20 11:01:42.440 *D* [                   ] JMX:   org.netxms.agent.SubAgent.parameterHandler(SubAgent.java:395)
2023.12.20 11:01:42.441 *D* [                   ] JAVA: Exception in parameter handler: java.lang.NullPointerException: null
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.wildfly.common.context.ContextManager.getPrivileged(ContextManager.java:271)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.wildfly.common.context.ContextManager.get(ContextManager.java:242)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remoting3.EndpointImpl.construct(EndpointImpl.java:231)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remoting3.EndpointBuilder.lambda$build$0(EndpointBuilder.java:128)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   java.security.AccessController.doPrivileged(Native Method)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remoting3.EndpointBuilder.build(EndpointBuilder.java:128)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remotingjmx.RemotingConnector.internalRemotingConnect(RemotingConnector.java:204)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remotingjmx.RemotingConnector.internalConnect(RemotingConnector.java:156)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.jboss.remotingjmx.RemotingConnector.connect(RemotingConnector.java:103)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.netxms.agent.jmx.Server.connect(Server.java:95)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.netxms.agent.jmx.Server.getAttributeValue(Server.java:234)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.netxms.agent.jmx.JmxPlugin$JmxObjectParameterAdapter.getValue(JmxPlugin.java:278)
2023.12.20 11:01:42.441 *D* [                   ] JAVA:   org.netxms.agent.SubAgent.parameterHandler(SubAgent.java:395)
2023.12.20 11:01:42.442 *D* [                   ] JAVA: SubAgent::parameterHandler("JMX.Memory.Heap.Current(name)", "JMX/JMX.Memory.Heap.Current(*)"): exception in Java code

Agent config file is as below:

MasterServers = 10.14.50.82
ConfigIncludeDir = C:\NetXMS\etc\nxagentd.conf.d
LogFile = C:\NetXMS\log\nxagentd.log
FileStore = C:\NetXMS\var
SubAgent = winperf.nsm
SubAgent = java.nsm
DebugLevel = 6

[JAVA]
Jvm = C:\Program Files\Java\jdk1.8.0_202\jre\bin\server\jvm.dll
Classpath = C:\NetXMS\lib\java\tools.jar;C:\NetXMS\lib\java\jboss-client.jar;C:\NetXMS\lib\java\jboss-cli-client.jar;
Plugin = jmx.jar

[JMX]
Server = name:service:jmx:remote+http://localhost:9990

Filipp Sudanov

Some info over the Internet suggests that jboss-cli-client.jar is better then then jboss-client.jar, so you may try removing C:\NetXMS\lib\java\jboss-client.jar; part from your classpath

deepb

It didn't make any difference. Same error.

NetXMS Forum

JVM Monitoring