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Implementing Jersey 2 Spring integration

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Jersey is the excellent Java JAX-RS specification reference implementation from Oracle. Last year, when we were starting to build RESTful backend web services for a high-volume website, we chose to use the JAX-RS API as our REST framework and Spring framework for dependency injection. Jersey was our JAX-RS implementation of choice. When the project was started JAX-RS API 2.0 specification ...

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MapReduce Algorithms – Understanding Data Joins Part II

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It’s been awhile since I last posted, and like last time I took a big break, I was taking some classes on Coursera. This time it was Functional Programming Principals in Scala and Principles of Reactive Programming. I found both of them to be great courses and would recommend taking either one if you have the time. In this post ...

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Mockito Templates for Eclipse

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Sometimes I miss the forest for the trees – and that for a disturbingly long time. I just became aware of this once again recently, typing one of the more verbose mockito expressions for the umpteenth time. The statement in question was a doAnswer(Answer) construct which always feels a bit cumbersome to code with the static import and generics stuff ...

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Applying aspect oriented programming

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1.Introduction The main target of the aspect oriented programming is the separation of cross-cutting concerns. When we talk about cross-cutting concerns we are referring to generic functionality that is used in several places in our system or application. These concepts are, among others:         Logging Transaction management Error handling Monitoring Security The way to achieve this separation ...

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Playing with Java 8 Lambdas in the JDT

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I’ve been playing with the language a bit while tinkering with the Java 8 support under development by the Eclipse Java development tools (JDT) project. I’ll admit that I’m a little underwhelmed by lambdas in Java 8. This, of course, comes from an Old Dude Who Knows Smalltalk (and LISP/Scheme). Like any good Smalltalk curmudgeon, when I set about learning ...

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Spring Integration Standalone application with Spring Boot

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I had earlier blogged about a way to write a standalone Spring Integration application. Spring Boot makes creating this standalone application much simpler. The simple flow was to poll the USGS service providing information about the earthquake activity around the world and to log this information. The flow described using Spring Integration is the following:           ...

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AES-256 Encryption with Java and JCEKS

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Overview Security has become a great topic of discussion in the last few years due to the recent releasing of documents from Edward Snowden and the explosion of hacking against online commerce stores like JC Penny, Sony and Target. While this post will not give you all of the tools to help prevent the use of illegally sourced data, this ...

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Java 8 news

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The first release candidates of Java 8, b128 and Java 8 RC2 showed up on February, fixing a serious flaw in the new Comparator API, where its new thenComparing() method had an unnecessary type restriction. The thenComparing() method of java.util.Comparator does not require that type U extend java.lang.Comparable, since keyComparator is used to compare extracted key objects. Java 8 RC2 ...

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Using Reflection for Testing

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I am working on a presentation about the ‘Single Responsibility Principle’, based on my previous post. It take most of my time. In the meantime, I want to share a sample code of how I use to test inner fields in my classes. I am doing it for a special case of testing, which is more of an integration test. ...

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OutOfMemoryError: solution antipatterns

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Throughout those years we have kept a close eye on the problems packaged in different flavours of OutOfMemoryError message. Daily digests on new questions on specific keywords via specialised services such as the Google Alerts have given us a good overview about the situations where applications fail with the java.lang.OutOfMemoryError in logs. The people facing the problem tend to fall ...

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