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How to use Events in Spring 3.x


There are many concepts and techniques for creating loosely coupled applications, Event is one of them. Events can eliminate many of dependencies in your code. Some times without events, SRP* is very hard to implement. Observable interface in java can help us to implement events (through Observer Pattern). But wait, the goal of this post is a fast tutorial about Spring ...

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CouchDB – Relax


Introduction Apache CouchDB, commonly referred to as CouchDB, is an open source database that focuses on ease of use and on being “a database that completely embraces the web”. It is a NoSQL database that uses JSON to store data, JavaScript as its query language using MapReduce and HTTP for an API. One of its distinguishing features is multi-master replication. ...

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Amazon DynamoDB


Introduction Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. Amazon DynamoDB automatically spreads the data and traffic for the table over a sufficient number of servers to handle the request capacity specified by the customer and the amount of data stored, while maintaining consistent and fast performance. All data items ...

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The Lean Change Method: 1000 Mile View


Why Lean Change? There are number of key risks to any change initiative faces, the lean change method is an attempt to provide agile change agent with tools and techniques to help manage those risks. Perhaps the biggest challenge any significant change faces is one of resistance. A combination of fear, resentment, and simple inertia causes groups of people to ...

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Ant Properties Nuances


Every once in a while, I’m reminded of a few subtle nuances of Ant properties that can, when forgotten, lead to confusion when dealing with Ant. In particular, the fact that Ant properties are generally immutable (not counting local properties as of Ant 1.8) and are set “permanently” upon their first setting can lead to slightly surprising results. The properties ...

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Basic Injection / Qualifiers, Scope


This is a continuation of the DI/CDI Basics tackled last week  – in this post, I’ll be discussing Basic Injection, Qualifiers and Scope. In our last topic, there we’re a great deal of information regarding the concepts of DI/CDI, we also discussed how these beans or class loaded using the annotations  -that makes up the composition of the object and ...

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Getting started with Apache Camel using Java


Apache Camel is a very useful library that helps you process events or messages from many different sources. You may move these messages through many different protocols such as between VM, HTTP, FTP, JMS, or even DIRECTORY/FILE, and yet still keep your processing code free of transport logic. This allows you to concentrate on digesting the content of the messages ...

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Throwing Exceptions – slow and ugly


This post is about a historical experience in conjunction with recently applied performance optimization techniques. Years ago I was swearing at a particular application where I had to discover the undocumented behaviour buried under a truly clever engineering “technique”. It was a typical monolithic Java EE application responsible for invoicing. The exact code is best to keep forgotten, but I ...

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Getting Application Security Vulnerabilities Fixed


It’s a lot harder to fix application security vulnerabilities than it should be. In their May 2013 security report, WhiteHat Security published some discouraging findings about how many application security vulnerabilities found in testing get fixed, and how long it takes to fix them. They found that only 61% of serious security vulnerabilities get fixed, and that on average, it ...

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Servlet Exception and Error Handling Example Tutorial


Sometime back I wrote a post about Exception Handling in Java but when it comes to web application, we need more than normal exception handling in java. Servlet Exception If you notice, doGet() and doPost() methods throw ServletException and IOException, let’s see what happens when we throw these exception from our application. I will write a simple servlet that will ...

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