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Deep dive into Optional class API in Java 8

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We all as Java programmers been through the situation where in we invoke a method to get some value and then instead of directly invoking some methods on the return value, we first have to check that the return value is not null and then invoke the methods on the return value. This has been a pain point which external ...

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Apache Camel Broker Component for ActiveMQ 5.9

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Embedding Apache Camel inside the ActiveMQ broker provides great flexibility for extending the message broker with the integration power of Camel. Apache Camel routes also benefit in that you can avoid  the serialization and network costs of connecting to ActiveMQ remotely – if you use the activemq component. One of the really great things about Apache ActiveMQ is that it ...

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Automatic generation of delegate methods with Macro Annotations

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Macro Annotations are a new type of macros, which are one of the candidates for inclusion (see also comment by Eugene below) in the upcoming Scala 2.11 release. However, thanks to the recently released Macro Paradise Scala 2.10 compiler plugin, with an extra option in the compiler/SBT settings, you can use them today, while still using a stable Scala version ...

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Thread Jiggling

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Overview Thread jiggler is a simple testing framework for exercising code to find threading problems. It works by modifying classes bytecode at runtime to insert Thread.yield() calls between instructions – “jiggling” the threads. This greatly increases the likelihood of discovering threading issues, and does it without you needing to change your production code. Background I was recently researching how to ...

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MIME Explained

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Sometime it happens that we use or refer to a software term or technology a lot of time without being very familiar with it. MIME is one of those terms for me. We use MIME standards to exchange messages between various endpoints, for example in email communication, web services etc. MIME is every where and we might have used it ...

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Using HA Singleton in JBoss 7

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Some time ago I had to change standard clustering behavior of Quartz Scheduler, and let it work without synchronizing over database. There are of course a lot of options to do that, but because I’m big fan of simplicity I’ve decided to use standard Spring @Scheduled configuration and totally skip thinking about cluster at this level. The idea was to ...

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Android Expandable/Collapsible Views

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Android Expandable/Collapsible Views Expandable/Collapsible Views (text, images, etc.) in Android are useful when we want to display all the available options on one screen, without the user having to scroll all the way to find the one he/she is interested in. What we are doing is trying to maximize the use of the available space on the screen by giving an ...

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Run your Hadoop MapReduce job on Amazon EMR

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I have posted a while ago how to setup an EMR cluster by using CLI. In this post I will show how to setup the cluster by using the Java SDK for AWS. The best way to show how to do this with the Java AWS SDK is to show the complete example in my opinion, so lets start. Set ...

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This is how Facebook Develops and Deploys Software. Should you care?

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A recently published academic paper by Prof. Dror Feitelson at Hebrew University, Eitan Frachtenberg a research scientist at Facebook, and Kent Beck (who is also doing something at Facebook), describes Facebook’s approach to developing and deploying their front-end software. While it would be more interesting to understand how back-end development is done (this is where the real heavy lifting is ...

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NetBeans 7.4 Beta Hints Warn of Ineffective Exception Handling

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There are numerous examples of how Java exception handling can be more difficult than it might first appear and Josh Bloch devoted an entire chapter of Effective Java (both editions) to exception handling. The checked exception model in Java remains “controversial.” I was pleased to see that the NetBeans 7.4 beta I recently downloaded has some hints to help with ...

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