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Introduction to Functional Interfaces – A concept recreated in Java 8

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Any java developer around the world would have used at least one of the following interfaces: java.lang.Runnable, java.awt.event.ActionListener, java.util.Comparator, java.util.concurrent.Callable. There is some common feature among the stated interfaces and that feature is they have only one method declared in their interface definition. There are lot more such interfaces in JDK and also lot more created by java developers. These ...

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Why Time Is No Measure For Progress

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One of the questions that Project Managers always pop up during projects is: “how many days will it take to finish this work?”. This is a very natural and sensible question. You want to know when a project will be finished, so people can have an expectancy of the needed budget, what functionality is in it and when it will ...

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REST with Apache Camel

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There are many ways to expose an HTTP endpoint in Camel: jetty, tomcat, servlet, cxfrs and restlet. Two of these components – cxfrs and restlet also support REST semantics just with few lines of code. This simple example demonstrates how to do CRUD operations with camel-restlet and camel-jdbc. The four HTTP verbs execute different operations and map to the following ...

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A 3 Step Guide to Getting Started with NoSQL

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I have been looking in to NoSQL databases for few months and would like to share my experience with it. This is a post might help you if you indent to start learning about the NoSQL Databases. I would try to link the resources which I found useful here. Step 1: What is NoSQL? NoSQL DEFINITION: Next Generation Databases mostly ...

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Indexing data in Solr from disparate sources using Camel

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Apache Solr is ‘the popular, blazing fast open source enterprise search platform’ built on top of Lucene. In order to do a search (and find results) there is the initial requirement of data ingestion usually from disparate sources like content management systems, relational databases, legacy systems, you name it… Then there is also the challenge of keeping the index up ...

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Introduction to Default Methods (Defender Methods) in Java 8

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We all know that interfaces in Java contain only method declarations and no implementations and any non-abstract class implementing the interface had to provide the implementation. Lets look at an example:                 public interface SimpleInterface { public void doSomeWork(); } class SimpleInterfaceImpl implements SimpleInterface{ @Override public void doSomeWork() { System.out.println('Do Some Work implementation ...

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Bidirectional @OneToMany / @ManyToOne association

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One of goals in programming is representing of models from real world. Very often an application need to model some relationship between entities. In the last article about Hibernate associations I have described rules of setting up the “one to one” relationship. Today I’m going to show you how to setup bidirectional “one to many” and “many to one” association. ...

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Bidirectional @OneToOne primary key association

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It’s time to continue articles about Hibernate. The last one was dedicated to unidirectional @OneToOne association. So today I will show you how to obtain bidirectional @OneTonOne primary key association. An example from this tutorial based on previous article. Let’s get started. I will work with the same tables which I have created previously. In order to setup a bidirectional ...

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ARM Virtualization Extensions – Introduction (Part 1)

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Sorry guys for another hiatus, my job at Calxeda keeps me busy. I was recently discussing ARM’s virtualization support with my friend Ali Hussain (yup, that’s our idea of a fun dinner conversation) and found some very interesting facts. I requested Ali to share his knowledge in a blog post series on this topic, so here you go. Ali is in ...

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