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Yearly Archives: 2012

Spring Shell Project Released

Spring Source released Spring Shell yesterday. Spring Shell is an interactive shell that can be easily extended with commands using a Spring based programming model. It has been extracted from the Spring Roo project by removing the OSGi dependencies and turned into a standalone project. This allows for an easier adoption by those who wish to use only interactive shell ...

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Play 2.0 framework and XA transactions

XA transactions are useful and out of the box, Play 2.0 today does not have support for them. Here I show how to add that support: First off, some examples when XA is useful: – JPA uses two physical connections if you use entities from two different persistence.xml – those two connections might need to be committed in one transaction, ...

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Android ListView example with Image and Text

In this tutorial I am going to show you how to create an Android ListView with images and text. You will learn how to load an image from a resource and how to set text to TextView . Here is the screenshot of the finished ListView. Android List View example on Samsung Galaxy Y s5360 ItemDetails class will help us ...

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Hunting a Random Bug – A True Story

java-interview-questions-answers

A few weeks ago, I finished a bug hunt for the RapidFTR open source project, which took me three evenings. I thought it might be worth sharing the story of the hunt. This article will describe what I did. I will give an overview of my journey to actually find the root cause of what was going on. My goal ...

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Maven Build Number Plugin – Sample Usage

Suppose we need to add a build number to some artifact (jar, war, etc.). Here I’d like to demonstrate the usage of buildnumber-maven-plugin. This post is based on: http://mojo.codehaus.org/buildnumber-maven-plugin/usage.html http://www.site.lalitbhatt.com/maven-build-number-plugin http://blog.peterlynch.ca/2009/11/buildnumber-maven-plugin-helpful.html http://apollo.ucalgary.ca/tlcprojectswiki/index.php/Public/Project_Versioning_-_Best_Practices#Build_Versioning We have some project and need to include into jar manifest file sequential build number which isn’t based on VCS (SVN, Git, Mercurial, etc.) revision number. Let’s create ...

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JavaOne 2012: A Walk Through of Groovy’s AST Transformations

I made the very short walk from Hilton Plaza A/B back to Hilton Golden Gate 3/4/5 to see the presentation ‘Walk through Groovy’s AST Transformations.’ Groovy‘s AST Transformations are something I’ve dabbled with directly a few times, but have more often benefited from others’ work with them. I had started reading the Packt Publishing book Groovy for Domain-Specific Languages, but ...

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Opinion: Performance Testing

Performance tuning an application is time consuming, and expensive. Useful tests often need dedicated hardware to run on. It’s specialised and time consuming to prepare the ground work and write the various fixtures needed to run, and whose only perceived benefit is preventing a production issue that you don’t even know will happen yet. Stereotypical Scenarios and Outcomes Here’s some ...

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Redis pub/sub using Spring

spring-interview-questions-answers

Continuing to discover the powerful set of Redis features, the one worth mentioning about is out of the box support of pub/sub messaging. Pub/Sub messaging is essential part of many software architectures. Some software systems demand from messaging solution to provide high-performance, scalability, queues persistence and durability, fail-over support, transactions, and many more nice-to-have features, which in Java world mostly ...

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RateLimiter – discovering Google Guava

RateLimiter class was recently added to Guava libraries (since 13.0) and it is already among my favourite tools. Have a look what the JavaDoc says: Let’s start from a simple example. Say we have a long running process that needs to broadcast its progress to supplied listener: def longRunning(listener: Listener) { var processed = 0 for(item <- items) { //..do ...

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