Friday Jun 29, 2007

Open-Sourcing of Solaris Cluster

Great to see Solaris Cluster starting down the open-source road.[Read More]

Friday Jun 22, 2007

Java and too many jars

One of the projects I'm helping architect is a pretty huge undertaking. It's got lots of separate functional blocks being deployed into classloaders in each Java SE JVM, and since they're being developed by lots of different teams, we're seeing the same kind of common infrastructure jars (hibernate, apache commons logging, jwsdp, etc.etc.) being loaded multiple times into some of the VMs.[Read More]

Tuesday May 22, 2007

JMX AttributeChangeNotifications, MXBeans, and a clever little helper class

This blog article introduces AttributeChangeNotifications and shows how to write a clever little helper class for generating attribute change notifications with the correct contents for the old and new attribute values, even for MXBeans with complex attribute types.[Read More]

Thursday Jan 18, 2007

Java: Redirecting System.out and System.err to a rolling log file


This blog article shows how to redirect System.out and System.err to your Java Logging subsystem, so that such output gets integrated into your debug log stream in a rolling log file.
[Read More]

Monday Jan 15, 2007

DTrace - (ab)using aggregations to expose other data

One restriction when using the Java DTrace API is that the only data type that can be collected on demand by a DTrace client is the aggregation.[Read More]

Friday Nov 10, 2006

JMX: Building a JMX Notification Hub

JMX Notifications allow MBeans to send asynchronous messages and are typically used to indicate a state change, a received event, or a problem.

However, it's necessary for clients to individually subscribe to each MBean that they are interested in receiving notifications from. When there are many such MBeans, or when the MBeans may be created dynamically, this can pose a problem for the client.

This article shows how to build a JMX Notification Hub MBean which provides a single place for clients to subscribe to receive notifications from many MBeans.[Read More]

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