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Securing HTTP-based APIs With Signatures

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I work at EMC on a platform on top of which SaaS solutions can be built. This platform has a RESTful HTTP-based API, just like a growing number of other applications. With development frameworks like JAX-RS, it’s relatively easy to build such APIs. It is not, however, easy to build them right.   Issues With Building HTTP-based APIs The problem ...

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Getting Started with Google GSON

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In Java world,  JSON is becoming de facto standard for data exchange format over XML because of its ease of use and efficiency in terms of transferring it. If you don’t know about JSON, it is Javascript object notation, a text based data exchange format which is collection of name-value where name is strictly of string type and value can ...

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Erlang for Java Developers

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You probably haven’t noticed, but it’s a couple of weeks since I last posted a blog. There is reason for this is that I’ve ruptured my Soleus and my leg is in a plaster cast. Being immobile I thought that it would be a good idea to investigate something totally different – it was either that or watch day time ...

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Introduction to Apache Camel

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Apache Camel is a open source implementation of famous Enterprise Integration Patterns.   Camel is a Routing and Mediation Engine and facilitates the developers to create routes and mediation rules in variety of Domain Specific language(DSL) such as java, Spring/XML, scala etc. Camel is versatile Camel uses URIs to supports large number of transport and messaging models such as HTTP, JMS, ...

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Splitting Large XML Files in Java

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Last week I was asked to write something in Java that is able to split a single 30GB XML file into smaller parts of configurable file size. The consumer of the file is going to be a middle-ware application that has problems with the large size of the XML. Under the hood it uses some kind of DOM parsing technique ...

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State Design Pattern in Java – Example Tutorial

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State pattern is one of the behavioral design pattern. State design pattern is used when an Object change it’s behavior based on it’s internal state. If we have to change the behavior of an object based on it’s state, we can have a state variable in the Object and use if-else condition block to perform different actions based on the ...

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Strategy Design Pattern in Java – Example Tutorial

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Strategy pattern is one of the behavioral design pattern. Strategy pattern is used when we have multiple algorithm for a specific task and client decides the actual implementation to be used at runtime. Strategy pattern is also known as Policy Pattern. We defines multiple algorithms and let client application pass the algorithm to be used as a parameter. One of ...

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10 Reasons not to Choose a Particular Open Source software

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We’re all Software Engineers of one type or another. Most of us have one thing in common, though: We’re lazy. And we know that someone else was less lazy and has already solved that tedious problem that we’re on. So we search for Open Source software. But the problem with Open Source software is: There are millions of options for ...

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Scalable real time state update with Storm

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In this post, I illustrate how to maintain in DB the current state of a real time event-driven process in a scalable and lock free manner thanks to the Storm framework. Storm is an event based data processing engine. Its model relies on basic primitives like event transformation, filtering, aggregation… that we assemble into topologies. The execution of a topology ...

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EJB passivation and activation example

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In this tutorial we are going to see how activation and passivation works in a Stateful Java Enterprise Session Bean. 1. Introduction Stateful Session Beans usually hold information about a specific client, and holds that information throughout the whole session. It is a fact though, that client sessions tend to be active for a respectable amount of time, and of ...

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