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Jersey Client: Testing external calls

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  Jim and I have been doing a bit of work over the last week which involved calling neo4j’s HA status URI to check whether or not an instance was a master/slave and we’ve been using jersey-client.   The code looked roughly like this:           class Neo4jInstance { private Client httpClient; private URI hostname; public Neo4jInstance(Client ...

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Why REST is so important

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This post is dedicated to REST, an architectural style of shaping webservices and the most misunderstood concept in the history of IT. This post is addressed to you who is designing webservice apis not being fully aware what REST actually means. I’m trying to give you the idea. This post is also addressed to you who think to know what ...

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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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