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Deep diving into Cloning

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Before we proceed with the cloning concept let’s refresh our basics with the object creation concept. When the objects are created using the new operator the objects gets the memory allocation in the Heap. In Java ideally objects are modified through reference variable only i.e. only the memory address of the object is copied and hence any changes in the ...

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Java2Days 2012: Java EE

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The Java2Days conference is the major event in Eastern Europe to present the latest trends in Java development. This year, it took place in Sofia, Bulgaria on 25 – 26 October. I was there and enjoyed the opportunity to taste some cutting edge Java, cloud, and mobile content delivered right to my home city, together with few of my colleagues ...

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Couchbase : Create a large dataset using Twitter and Java

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An easy way to create large dataset when playing/demonstrating Couchbase -or any other NoSQL engine- is to inject Twitter feed into your database. For this small application I am using: Couchbase Server 2.0 Server Couchbase Java SDK (will be installed by Maven) Twitter4J (will be installed by Maven) Twitter Streaming API called using Twitter4J In this example I am using ...

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Request and response – discovering Akka

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In the previous part we implemented our first actor and sent message to it. Unfortunately actor was incapable of returning any result of processing this message, which rendered him rather useless. In this episode we will learn how to send reply message to the sender and how to integrate synchronous, blocking API with (by definition) asynchronous system based on message ...

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Investigating Deadlocks – Part 4: Fixing the Code

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In the last in this short series of blogs in which I’ve been talking about analysing deadlocks, I’m going to fix my BadTransferOperation code. If you’ve seen the other blogs in this series, you’ll know that in order to get to this point I’ve created the demo code that deadlocks, shown how to get hold of a thread dump and then analysed ...

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Polyglot Persistence: EclipseLink with MongoDB and Derby

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Polyglot persistence has been in the news since some time now. Kicked off by the famous Fowler post from end 2011 I see more an more nice ideas coming up. Latest one was a company internal student project in which we used Scala as a backend persisting data into MongoDB, Derby and Solar. I’m not a big fan of Scala and ...

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20 Kick-ass programming quotes

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This post serves as a compilation of great programming quotes, quotes from famous programmers, computer scientists and savvy entrepreneurs of our time. Some of them are funny, some of them are motivational, some of them are… just awesome! So, in no particular order, let’s see what we have…

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Oracle ADF Mobile World! Hello!

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Hello, ADF Mobile, World! As you probably already know… ADF Mobile is here! Here are some links that will make you feel at home.. Home page of ADF Mobile: http://www.oracle.com/technetwork/developer-tools/adf/overview/adf-mobile-096323.html How to setup your JDeveloper: http://docs.oracle.com/cd/E18941_01/tutorials/MobileTutorial/jdtut_11r2_54_1.html Developer’s Guide http://docs.oracle.com/cd/E35521_01/doc.111230/e24475/toc.htm Some sales stuff http://www.oracle.com/technetwork/developer-tools/jdev/adf-mobile-development-129800.pdf And of course, the samples!! Samples are good. We need samples! Samples are goooood: http://www.oracle.com/technetwork/developer-tools/adf/adf-mobile-samples-1865088.html Additional references: http://technology.amis.nl/2012/10/22/adf-mobile-is-now-generally-available/ Well, ...

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JPA/Hibernate: Version-Based Optimistic Concurrency Control

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This article is an introduction to version-based optimistic concurrency control in Hibernate and JPA. The concept is fairly old and much has been written on it, but anyway I have seen it reinvented, misunderstood and misused. I’m writing it just to spread knowledge and hopefully spark interest in the subject of concurrency control and locking. Use Cases Let’s say we ...

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By your Command – Command design pattern

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Command design pattern is one of the widely known design pattern and it falls under the Behavioral Design Pattern (part of Gang of Four). As the name suggests it is related to actions and events in an application.   Problem statement: Imagine a scenario where we have a web page will multiple menus in it. One way of writing this ...

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