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Active7 years, 9 months ago
I m using Command-line JMX Client to be able to query ActiveMQ Server. At the same time I want to be able to set values dynamically to the server. such as MemoryLimit.
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Is it possible to set values via Command-Line JMX client, if yes , how can i set the memory limit?
This is how i was able to query.
but how can i set memorylimit?
I tried below:
and failed as below.
11/18/2011 11:56:28 -0800 org.archive.jmx.Client setMemoryLimit=300000: Operation setMemoryLimit not found.
DarthVader
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1 Answer
Edit
I'd recommend dropping that jmxclient and switching to:
It looks to be supported and better documented. I suspect that it will work and give you access to the setters -- if they exist.
If the set method does exist then the following should work:
Here are the docs:
![Cmdline jmxclient download itunes for windows Cmdline jmxclient download itunes for windows](/uploads/1/2/6/2/126284476/867420833.jpg)
To find out which attributes are available for setting and getting, I'd use jconsole. If you are using a Java6+ jconsole, you field click on the bean you want to get information from. That should show you the
ObjectName
to use on the command line. Then if you open the attributes list, the name of the attribute should have a corresponding get method. If the value is colored blue then there should be a corresponding set method.![Download itunes for windows 10 Download itunes for windows 10](/uploads/1/2/6/2/126284476/179254435.jpg)
For example, if you open up the
java.lang
folder in jconsole, you should be able to click on ClassLoading
. That shows you the ObjectName
to use is java.lang:type=ClassLoading
. You can then do the following to list the various attributes and operations available:You should see the getters and the setters. Here's how you get the
Verbose
attribute:For some reason my version cmdline-jmxclient does not know how to do
GrayGrayboolean
type so it doesn't show up as a setter. If it did you should be able to do:98.9k1515 gold badges239239 silver badges308308 bronze badges
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Active3 months ago
Are there any libraries that would allow me to call a JMX MBean method from a shell script. We expose some operations/admin commands through JMX, and we could have our admins use JConsole, or VisualVM, but some tasks are better left to automation. In that automation we'd like to be able to call a JMX MBean method on our running server, preferably from a shell script.
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9 Answers
The following command line JMX utilities are available:
- jmxterm - seems to be the most fully featured utility.
- cmdline-jmxclient - used in the WebArchive project seems very bare bones (and no development since 2006 it looks like)
- Groovy script and JMX - provides some really powerful JMX functionality but requires groovy and other library setup.
- JManage command linefunctionality - (downside isthat it requires a running JManageserver to proxy commands through)
Groovy JMX Example:
cmdline-jmxclient example:
If you have an
- MBean: com.company.data:type=datasystem,id=0
With an Operation called:
- jmxForceRefresh()
Then you can write a simple bash script (assuming you download cmdline-jmxclient-0.10.3.jar and put in the same directory as your script):
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I've developed jmxfuse which exposes JMX Mbeans as a Linux FUSE filesystem with similar functionality as the /proc fs. It relies on Jolokia as the bridge to JMX. Attributes and operations are exposed for reading and writing.
For example, to read an attribute:
to write an attribute:
to invoke an operation:
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The Syabru Nagios JMX plugin is meant to be used from Nagios, but doesn't require Nagios and is very convenient for command-line use:
Austin MillsAustin Mills
Potentially its easiest to write this in Java
This would compile to a single .class and needs no dependencies in server or any complicated maven packaging.
call it with
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A little risky, but you could run a curl POST command with the values from the form from the JMX console, its URL and http authentication (if required):
Beware: the method index may change with changes to the software. And the implementation of the web form could change.
The above is based on source of the JMX service page for the operation you want to perform:
Source of the form:
Community♦
BBayBBay
Take a look at JManage. It's able to execute MBean methods and get / set attributes from command line.
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You might want also to have a look at jmx4perl. It provides java-less access to a remote Java EE Server's MBeans. However, a small agent servlet needs to be installed on the target platform, which provides a restful JMX Access via HTTP with a JSON payload. (Version 0.50 will add an agentless mode by implementing a JSR-160 proxy).
Advantages are quick startup times compared to launching a local java JVM and ease of use. jmx4perl comes with a full set of Perl modules which can be easily used in your own scripts:
You can also use alias for common MBean/Attribute/Operation combos (e.g. for most MXBeans). For additional features (Nagios-Plugin, XPath-like access to complex attribute types, ...), please refer to the documentation of jmx4perl.
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@Dougnukem answer helped me a lot. I have taken the Groovy approach (using groovy 2.3.3).
I did some changes on Dougnukem code.This will work with Java 7 and will print two attributes to stdout every 10 sec.
Compile this code into a jar using maven-compiler-plugin so you will not require groovy installation only the groovy-all.jar .Below is the relevant plugin definition and dependency.
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Wrap it with a bat or a shell and it will print the data to stdout.
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I'm not sure about bash-like environment. You might try some simple wrapper programs in Java (with program arguments) that invoke your MBeans on the remote server. You can then call these wrappers from the shell script
If you can use something like Python or Perl, you might be interested in JSR-262 which allows you to expose JMX operations over web services. This is scheduled to be included in Java 7 but you might be able to use a release candidate of the reference implementation
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