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Demeter Law

Hello, how are you?Let us talk today about the Demeter Law. It is a pattern of Object Orientation that helps us to lower our coupling, decrease our maintenance impact and ...
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Chain of Responsibility Pattern in Java

Chain of Responsibility design pattern is needed when a few processors should exist for performing an operation and a particular order should be defined for those processors. Also the ...
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Bye, Bye, 5 * 60 * 1000 //Five Minutes, Bye, Bye

In this post I am going to talk about one class that was first introduced in version 1.5, that I have used too much but talking with some people they said that they didn’t know ...
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Apache Commons SCXML: Finite State Machine Implementation

This article mentions about Finite State Machines (FSM), SCXML ( State Chart extensible Markup Language) and Apache Common’s SCXML library. A basic ATM finite state machine sample ...
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Java concurrency – Feedback from tasks

Picking up from where I left off in my last post about the java.util.concurrent package, it’s interesting and sometimes mandatory to get feedback from concurrent tasks after they ...
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JRockit – JRCMD useful commands

I have been using JRockit since many years 2007. I find it slower than Hotspot, but it has been always better on diagnosis and analysis of problems. Since last summer, I have been working ...
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Top 5 Reasons for Not Using JavaDoc in the Next Project

JavaDoc is an absolutely must for the development of frameworks and libraries which provide a public interface for others, e.g. Spring Framework, JDKs. For in house enterprise software ...
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Odd practices in Java

Overview There are a number of practices in Java which oddly baffle me. Here are but a few. Using -Xmx and -Xms The option -Xmx is widely used to set the maximum memory size. As noted ...
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Tracking excessive garbage collection in Hotspot JVM

Quite frequently due to memory leaks or other memory problems applications freeze leaving only the garbage collector (GC) process running unsuccessfully trying to free some space. ...
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Java Thread deadlock – Case Study

This article will describe the complete root cause analysis of a recent Java deadlock problem observed from a Weblogic 11g production system running on the IBM JVM 1.6. This case ...
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