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Observer Pattern with Spring Events

spring-interview-questions-answers

INTRODUCTION The essence of the Observer Pattern is to ‘Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.’ GoF. Observer pattern is a subset of publish/subscribe pattern which allows a number of observer objects to see an event. This pattern can be used in different situations, but in ...

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Which Java thread consumes my CPU?

What do you do when your Java application consumes 100% of the CPU? Turns out you can easily find the problematic thread(s) using built-in UNIX and JDK tools. No profilers or agents required. For the purpose of testing we’ll use this simple program: public class Main { public static void main(String[] args) { new Thread(new Idle(), 'Idle').start(); new Thread(new Busy(), ...

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Gradle Custom Plugin

This tutorial describes the way of creating Gradle standalone custom plugin. It covers the following topics Creating task, and using it in Custom plugin Stand alone Custom plugin Short plugin id Customize Gradle setting using settings.gradle Project info : Gradle version : 1.1 OS platform : Ubuntu 12.10 Prerequisite : Basic understanding of Gradle script. Creating the Stand alone custom ...

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What’s better – Big Fat Tests or Little Tests?

Like most startups, we built a lot of prototypes and wrote and threw out a lot of code as we tried out different ideas. Because we were throwing out the code anyways, we didn’t bother writing tests – why write tests that you’ll just throw away too? But as we ramped the team up to build the prototype out into ...

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Java memes which refuse to die

Also titled; My pet hates in Java coding.  There are a number of Java memes which annoy me, partly because they were always a bad idea, but mostly because people still keep picking them up years after there is better alternatives. Using StringBuffer instead of StringBuilder The Javadoc for StringBuffer from 2004 states As of release JDK 5, this class ...

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Bcrypt, Salt. It’s The Bare Minimum.

The other day I read this Arstechnica article and realized how tragic the situation is. And it is not this bad because of the evil hackers. It’s bad because few people know how to handle one very common thing: authentication (signup and login). But it seems even cool companies like LinkedIn and Yahoo do it wrong (tons of passwords have ...

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Overqualified is Overdiagnosed

I’ve been inspired by comments on prior articles to discuss the sensitive topics of ‘overqualification’ and ageism. My Why You Didn’t Get The Job and Why You Didn’t Get The Interview posts were republished on a few sites, resulting in some active debates where at some point a participant states that the real reason that they weren’t hired was that ...

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Rewrite to the edge – getting the most out of it! On GlassFish!

A great topic for modern application development is rewriting. Since the introduction of Java Server Faces and the new lightweight programming model in Java EE 6 you are struggling with pretty and simple, bookmarkable URLs. PrettyFaces was out there since some time and even if it could be called mature at the 3.3.3 version I wasn’t convinced. Mainly because of ...

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Customizing Spring Data JPA Repository

Spring Data is a very convenient library. However, as the project as quite new, it is not well featured. By default, Spring Data JPA will provide implementation of the DAO based on SimpleJpaRepository. In recent project, I have developed a customize repository base class so that I could add more features on it. You could add vendor specific features to ...

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