Wednesday Jun 20, 2007

A java program that reads the manifest of a jar file

Today, a colleague asked me if I had an example of a Java program that would read the manifest of a jar file. Since I hadn't any, I created one. Here it is. It's very simple, just a few lines of code...

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Friday Jun 15, 2007

JMX in Javalobby Newsletter

It's always nice to read praise about a technology you've been working on, but especially so when it comes from some prominent member of the java community.

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Tuesday May 29, 2007

Federating MBeanServers with OpenDMK

Project OpenDMK includes a cascading API that makes it possible to federate MBeanServers. When several applications are running in the same JVM, this example shows how the OpenDMK cascading API can be used to keep applications MBeans isolated by using one MBeanServer per application instance, but still presenting a single point of access to remote clients by federating all MBeanServers in a single global MBeanServer.

Federation of MBeanServers is also discussed for JMX 2.0. Although it does share some concepts with the cascading feature of OpenDMK, it will also have some noticeable differences.

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Monday May 21, 2007

OpenJDK and NetBeans: A Tutorial to build JConsole and JMX Sources

The OpenJDK and NetBeans IDE WebSite has now a tutorial that shows how to build various part of the JDK, and the JDK itself: in particular, there's a chapter dedicated to building the JMX API sources, and another one dedicated to building the JConsole graphical tool sources.

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Tuesday May 15, 2007

We are open sourcing the Java Dynamic Management Kit

You may have seen an OpenDMK project lingering on for a few weeks: Well, I am pleased to announce that we have pushed a first snapshot of the sources just before JavaOne.

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Friday May 11, 2007

JMX Interoperation With Non Java Technologies

We have written a white paper about JMX Interoperation With Non Java Technologies. This whitepaper explains how the Web Services Connector for JMX Agents (defined by JSR 262) was successfully used to provide interoperation with non Java technologies and products such as Hewlett Packard's OpenView Operations Agent (HP-OVO), and Microsoft's Windows Remote Management (WinRM).

Update: Jean-Francois has written an article on how to deploy the JMX WS Connector within a J2EE Application server.
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Thursday May 10, 2007

OpenJDK is out, with a JMX and JConsole NetBeans project!

As you were already informed by many prominent bloggers from the Java Community, the OpenJDK Project is finally out!

And of course, the JMX technology and JConsole graphical tool are part of it. Cherry on the cake: we are even providing NetBeans IDE `projects' that will let you work easily on JMX and JConsole without having to compile the whole OpenJDK!

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Friday May 04, 2007

A small program that prints the attributes of all JVM MBeans

A few weeks ago I blogged about how to programmatically access the JVM Monitoring information. Here is a small Java application that prints all the attributes of all the JVM Management & Monitoring MBeans.

The sample simply prints the attributes of the JVM MBeans from the JVM in which it runs. It would be very easy to make it print the information of a remote JVM. You would just need to copy the code from the JVMRuntimeClient shown in my previous blog: [More]

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Friday Apr 20, 2007

How to retrieve JVM information using JRuby

A few weeks ago, I posted a small example showing how to programatically retrieve the JVM Management and Monitoring information. Jeff Mesnil also recently wrote a two parts blog article showing how to write a JMX client using JRuby.

Piecing these two articles together I'm going to show how to prototype this using JRuby in jconsole Script Shell plugin.

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Thursday Mar 15, 2007

How Can I Find All Instances Of WombatMBean?

Here is a small example that demonstrates how to retrieve all MBeans which are wombats, including domestic wombats and feral wombats, which are very ferocious.

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Friday Mar 09, 2007

How To Retrieve Remote JVM Monitoring And Management Information

How to use JMX to programatically retrieve the information that JConsole displays is easy. Here is a small JMX Client Program that shows how you can programatically retrieve the JVM Management and Monitoring information from a remote JVM.

[Read More]

Monday Mar 05, 2007

Rencontrez James Gosling aux Sun TechDays à Paris! [and it's free...]

Meet James Gosling at Sun Tech Days Paris: vous pourrez aussi rencontrer des membres de l'équipe JMX lors de la session pointue sur JMX ("Java SE Beyond Basics"), Mercredi 21 Mars.

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Friday Mar 02, 2007

Brian Goetz: Trust the JVM. It's smarter than you think.

I have just read the new excellent interview of Brian Goetz, Writing Better Code published on

In this interview Brian goes against a few myths about code optimization, and provides some insightful advices for writing faster code. One of its more striking moto is:

    Trust the JVM. It's smarter than you think.
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Friday Feb 23, 2007

JVM Monitoring: JMX or SNMP?

Since JavaTM SE 5.0, the JRE provides a means to manage and monitor the Java Virtual Machine. It comes in two flavors: one is based on the Java Management Extension (JMXTM), the other is a small SNMP agent that builds upon the Management and Monitoring API of the Java SE platform and exposes the same information through SNMP.

A legitimate question that often arises to newcomers to the JMX and SNMP technologies is:

Which technology should I use to monitor my JVM? JMX, or SNMP?

In this blog I will try to provide some guidance on this subject.

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Tuesday Jan 09, 2007 When and Why.

Q: When is a Standard MBean not a Standard MBean?
A: When it's a StandardMBean.

In this article I will give a few tips concerning the StandardMBean class, and in particular, when and why it becomes interesting to use it.

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Daniel Fuchs blogs on Scene Builder, JMX, SNMP, Java, etc...

The views expressed on this blog are those of the author and do not necessarily reflect the views of Oracle.


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