Optis community blog » Java

Check exceptions vs unchecked exceptions

admin — Fri, 18 Sep 2009 05:32:51 +0000

Another interesting article about checked-exceptions. I know this is not new, but every time a new project starts, I’m having the same discussion about checked-exceptions.

Once upon a time Java created an experiment called checked-exceptions, you know you have to declare exceptions or catch them. Since that time no other language (I know of) has decided to copy this idea, but somehow the Java developers are in love with checked exceptions…

IBM Monitoring and Diagnostic Tools for Java – Health Center

admin — Wed, 27 May 2009 05:18:40 +0000

Health Center is a low-processor and memory usage diagnostic tool for monitoring the status of a running IBM Java Virtual Machine (JVM). It provides live information and recommendations in each of the following areas:

Classes – information about classes being loaded
Environment – details of the configuration and system of the monitored application
Garbage collection – information about the Java heap and pause times
Locking – information about contention on inflated locks
Profiling – sampling profile of Java methods including call paths

James Taylor and his thoughs on IBM and ILog

admin — Fri, 30 Jan 2009 06:45:47 +0000

Recently James Taylor wrote some articles about his thoughs on IBM and ILog.

Read his thoughs in the following articles …

Fast development with OpenXava

admin — Mon, 26 Jan 2009 05:56:05 +0000

OpenXava is a productive way for creating AJAX Enterprise Applications with Java. Indeed, it’s faster developing with OpenXava than with Ruby On Rails, Spring MVC, or any other MVC framework. This is because in OpenXava you only have to write the Model. The Controllers are reused, and the View are generated automatically.

VisualVM All-in-one Java Troubleshooting Tool

admin — Thu, 15 Jan 2009 05:44:57 +0000

VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling capabilities. Designed for both production and development time use, it further enhances the capability of monitoring and performance analysis for the Java SE platform

Visit the official website

The Eclipse Memory Analyzer

admin — Thu, 08 Jan 2009 06:00:56 +0000

The Eclipse Memory Analyzer is a fast and feature-rich Java heap analyzer that helps you find memory leaks and reduce memory consumption.

The Memory Analyzer was developed to analyze productive heap dumps with hundreds of millions of objects. Once the heap dump is parsed, you can re-open it instantly, immediately get the retained size of single objects and quickly approximate the retained size of a set of objects. The reference chain to the Garbage Collection Roots then details why the object is not garbage collected.

Using these features, a report automatically extracts leak suspects. It includes details about the objects accumulated, the path to the GC Roots, plus general information like system properties.

Some screenshots:

1. Overview

2. Histogram

3. Dominator tree

4. Path to GC Roots

5. Dominator Tree Grouped by Class Loader

Product home

ProGuard Version 4.3 – Free Optimizer and Obfuscator

admin — Fri, 19 Dec 2008 05:39:04 +0000

Eric Lafortune announced a new version of his free Java class file shrinker, optimizer, obfuscator, and preverifier.

ProGuard is distributed under the terms of the GPL. You can download the program, documentation, and examples from proguard.sourceforge.net.

Dependency injection with Guice

tobbawi — Wed, 10 Dec 2008 05:35:39 +0000

Guice is Google’s open source dependency injection framework for Java™ development. It enables better testing and modularity by taking away the pain of writing your own factories. Nicholas Lesiecki offers a tour of the most important Guice concepts that will leave you ready to Guice up your applications.

Read the full article here