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Variations for computing results from sequences in Scala

Introduction A common question from students who are new to Scala is: What is the difference between using the map function on lists, using for expressions and foreach loops? One of the major sources of confusion with regard to this question is that a for expression in Scala in not the equivalent of for loops in languages like Python and ...

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Covering your tests with Cobertura, JUnit, HSQLDB, JPA

Hello, how are you? Let us talk today about a very useful tool named “Cobertura”. This framework has the same functions of the Emma framework that we saw in another post. The major difference between Cobertura and Emma is that Cobertura displays the resume page with graphics. If you want to see the other topics about this subject click on ...

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JavaFX 2.0 and Scala, Like Milk and Cookies

JavaFX 2.0 and Scala are both great technologies individually, but work even better when used together. JavaFX 2.0 is a powerful rich client technology with advanced graphics, animation, and media capabilities. Scala is a simple, yet powerful language with advanced language features for writing domain-specific languages (DSLs). Add a little Scala UI DSL to your JavaFX 2.0 project and you ...

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Spring 3 MVC Exception Handlers

spring-interview-questions-answers

The majority of the Spring 3 error handling sample code that I’ve come across only ever seems to give the simplest overview of its usage, yet how we handle errors is, some would say, more important than how the normal code works. This was borne out the other day when I came across a simple ‘GOTCHA’ in a Spring (2) ...

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Technical Debt – How much is it Really Costing you?

The idea behind the technical debt metaphor is that there is a cost to taking short cuts (intentional technical debt) or making mistakes (unintentional technical debt) and that the cost of not dealing with these short cuts and mistakes will increase over time. The problem with this metaphor is that with financial debt, we know how much it would cost ...

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Patching Java at runtime

This article will slightly highlight how to fix issues with third party libs that can’t be circumvented are difficult to exclude/bypass/replaced simply provide no bugfix In such cases solving the issue remains a challengig task. As a motivation for this scenario consider the attacks on “hash indexed” data structures, such as java.util.Hashtable and java.util.HashMap (for those who are not familar ...

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Apache Mahout: Getting started

Recently I have got an interesting problem to solve: how to classify text from different sources using automation? Some time ago I read about a project which does this as well as many other text analysis stuff – Apache Mahout. Though it’s not a very mature one (current version is 0.4), it’s very powerful and scalable. Build on top of ...

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