Tuesday Nov 25, 2008
Tuesday Jul 29, 2008
By daniel on Jul 29, 2008
... So many words I couldn't even put them all in the title...
I've been asked several times how to make my example of javaagent which starts a firewall friendly JMX RMI Connector work on JDK 5. Well, here is how. However, beware of the catch: if you use SSL and want to connect with JConsole then you need to use Java 6 JConsole on the client side.[Read More]
Friday Jul 11, 2008
By daniel on Jul 11, 2008
The first stable release of OpenDS is out! This LDAP Server written in Java can be monitored both through JMX and SNMP.[Read More]
Tuesday May 06, 2008
By daniel on May 06, 2008
Although it might not be a very good idea to define your management
model based on how it will be displayed by a given GUI, such as that
provided by JConsole or
VisualVM, I believe it is nonetheless
interesting to explore the various ways in which a complex type
such as a
Map<String,Integer> could be modeled and
exposed through an MXBean attribute.
Thursday Mar 13, 2008
By daniel on Mar 13, 2008
Wednesday Jan 09, 2008
By daniel on Jan 09, 2008
JMX is a wonderful tool to monitor and troubleshoot running applications. The new JDK 6 Attach API makes it very easy to attach to a running Java process, and start a JMX agent that will expose monitoring and configuration data to JMX consoles - like JConsole. However, there are some situations where you wish to start a JMX agent on demand, explore the monitoring data or diagnose the probable cause of an observed problem, and then close your JMX agent, leaving the application just how you found it.
In this post, I will discuss a means by which you can upload and start such a remotely stoppable JMX agent. Here is how.[Read More]
Monday Dec 10, 2007
Monday Oct 22, 2007
By daniel on Oct 22, 2007
This post explains how you can configure your Java application to export a single port using JMX RMI Connector Server over SSL. This is particularly useful when your application is located behind a firewall, because you will only need to let through a single port. However, using a single port when SSL is enabled requires a little care, because it can only work if the same RMI Socket Factories are used everywhere: indeed the same port cannot be shared by two different RMI Socket Factories. So at the risk of boring you, here is my third post on the subject.[Read More]
Wednesday Oct 17, 2007
By daniel on Oct 17, 2007
Friday Oct 05, 2007
By daniel on Oct 05, 2007
I recently received a question from a member of the Java community asking for advises on how to implement a trap sending service for a highly multi-threaded application.
Here is an example/test which shows that the SnmpAdaptorServer from Project OpenDMK can be used. The example also allowed me to find a bug.[Read More]
Tuesday Oct 02, 2007
By daniel on Oct 02, 2007
Wednesday Sep 12, 2007
By daniel on Sep 12, 2007
In my previous blog entry, I have talked about how to take advantage of java agents in order to start a custom JMX Connector in a Java application, without modifying the application. This is particularly useful when you need to monitor Java applications which are located behind a firewall. In that case, it makes it possible to write a java agent that will start a RMI connector configured in a firewall-friendly manner. However, there's a catch. This is what this entry is about.[Read More]
Wednesday Jul 25, 2007
By daniel on Jul 25, 2007
In a recent comment on my blog about Troubleshooting Connection Problems in JConsole I was asked the following question:
Can you simply explain how run jconsole on a client machine to connect to an unmodifiable applicaton that run on a server. One and only one port on the server is open though firewall for managing the application.
Here is how.[Read More]
Friday May 04, 2007
By daniel on May 04, 2007
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][Read More]
Friday Apr 20, 2007
By daniel on Apr 20, 2007
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.
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.
- Jerome has written a nice article on integrating SceneBuilder with several IDEs
- A nice article on NetBeans 7.2 and JavaFX SceneBuilder
- Connecting SceneBuilder edited FXML to Java code
- Welcome to blogs.oracle.com
- Project OpenDMK has moved to the new java.net infrastructure.
- The Mystery Of Multiple MBeanServers
- Saved by ZFS while fighting with Firefox 3 configuration
- Mercurial: listing files modified in incoming changesets, and guessing conflicts...
- Java 5, premain, RMI Connectors, Single Port, SSL, and Firewall.
- OpenDS 1.0 is Released: A Java Open Source LDAP Server with JMX and SNMP monitoring
- Java for SysAdmins
- My Posts on SDN
- Need professional support?
- Need some training?
- Open Source & Sun
- Planet JDK
- Project OpenDMK
- Questions about JMX?
- Questions about SNMP?
- The Aquarium
- The Java Tutorials' Blog
- VisualVM (JMX Inside)
- What Is JMX
- Sun Eco Center
- JMX Home Page
- Java DMK (SNMP inside!)
- NetBeans Home Page