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Hibernate Facts: Always check Criteria API SQL queries

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Criteria API is very useful for dynamically building queries, but that’s the only use case where I’d use it. Whenever you have an UI with N filters that may arrive in any M combinations, it makes sense to have an API to construct queries dynamically, since concatenating strings is always a path I’m running away from. The question is, are ...

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Why I stopped using Spring

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My post on DZone about Humble Architects sparked somewhat of a controversy, especially around my disparaing comments regarding Spring and Dependency Injection Frameworks. In this post, I expand on my I stopped using Spring. I was one of the earliest adopter of Spring in Norway. We developed a large system where we eventually had to start thinking about things like ...

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11 areas an Agile Project Manager needs to focus on

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In my previous posts I focused on the Attitudes of a Great Software Developer and the Attitudes of a Great Software Tester. An Agile project’s success also depends a lot on the Agile Project Manager. The decisions he takes and the emphasis he provides on certain areas will pave the way for a successful Agile Project. In this post, I ...

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Garbage Collector guidelines and tips

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These are some of the guidelines and tips I usually look at when I need to tune the GC. Are mostly taken by the following 2 books and few of them from my experience: Java Performance JBoss AS 5 Performance Tuning Hopefully they will be useful for someone else out there! Garbage Collector XX:+AggressiveOpts sets a HotSpot internal boolean variable ...

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Scaling Spring Batch – Step Partitioning

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We have talked about how to get up and running with Spring Batch in a few of previous articles. Now, we’re going to start discussing some of the strategies available for scaling Spring Batch. This article will focus on partitioning a step so that the step has several threads that are each processing a chunk of data in parallel. This ...

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When something works, share it!

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When I joined PaddyPower in October 2012 I was asked to improve quality without affecting throughput.  I studied the teams for a couple of months and I came up with this model based on Gojko Adzic’s Specification By Example and a white paper on ATDD from Elisabeth Hendrickson. One year after, the bugs are a distant memory and cycle time ...

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Dozer: Mapping JAXB Objects to Business/Domain Objects

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Dozer is an open source (Apache 2 license) "Java Bean to Java Bean mapper that recursively copies data from one object to another." As this description from its main web page states, it is used to map two JavaBeans instances for automatic data copying between the instances. Although these can be any of the many types of JavaBeans instances, I ...

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Service Composition: Modularity for SOA and Event-Driven Applications, Part I

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Modularity is a cornerstone of good application design. As systems become more distributed, we’re faced with unique challenges to achieving effective modularity. How do you organize, encapsulate, and version loosely-coupled services? In this series of posts, I will cover how modular architectures were built for two diverse Java-based applications: a highly reliable SOA tax processing platform that interfaces with legacy ...

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