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The Economics of Open Source : Seek Free Code. Find Innovation.


In the past, many technologists had to evangelize open source within the enterprise. We had to justify its use, reassure executives about security, ability to support, etc.  Recently,  I believe those tables have turned.  More and more, businesses are asking the question, “Isn’t there an open-source solution for this?”. Not only has open-source been accepted, but its become the preferred ...

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JAAS-secured JAX-RS end point


With the advent of RESTFUL (JAX-RS) as the “preferred” way to create web service end points, for a long time I have always wondered how people implement security mechanism around it. At the end of the day, I presume the underlying implementation of JAX-RS is servlet, and therefore its security might also be around what is already provided by the ...

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Bluetooth Data Transfer with Android


To develop an Android application making use of data transfers via Bluetooth (BT), one would logically start at the Android Developer’s Bluetooth page, where all the required steps are described in details: device discovery, pairing, client/server sockets, RFCOMM channels, etc. But before jumping into sockets and threads programming just to perform a basic BT operation, let’s consider a simpler alternative, ...

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Deep dive into Optional class API in Java 8


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


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


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


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


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


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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