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Java 8 Friday Goodies: Lambdas and SQL

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At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. We have blogged a couple of times about some nice Java 8 goodies, and now we feel it’s time to start a new blog series, the… Java 8 Friday Every Friday, ...

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Cost of Delay Due to Multitasking, Part 2

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In Cost of Delay: Not Shipping on Time, Part 1, I introduced you to the notion of cost of delay. I said you could reduce the cost of delay by managing your projects: have shorter projects, using release criteria, or selecting a lifecycle that manages the risk. Sometimes, you don’t have short projects, so projects get backed up, and your ...

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My advice to (junior) developers about their career

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The last couple of months I have met several young developers that either looking for the first job or are still trying to get their bachelor degree. Many of them asked me to give them my advice on how they can make their first steps in the software development career. It’s really nice to see young people to care so ...

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Grails Goodness: Customize Root Element Name Collections for XML Marshalling

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When we convert a List or Set to XML using the Grails XML marshalling support the name of the root element is either <list> or <set>. We can change this name by extending the org.codehaus.groovy.grails.web.converters.marshaller. xml.CollectionMarshaller. We must override the method supports() to denote the type of collection we want to customize the root element name for. And we must ...

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Don’t Make Me Read Your Resume (How to Apply to Jobs)

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I will read your résumé unless it’s 10 pages, but (just as you didn’t want to write your résumé) I really don’t want to read your résumé. To put it another way, I don’t want to read it because I must in order to make a yes/no decision. Ideally, I can decide to speak to you based on a few sentences in the ...

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Spring JMS: Processing messages within transactions

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1.Introduction This post will show you how an error in the execution of the consumer during the asynchronous reception of messages with JMS, can lead to the loss of messages. I then will explain how you can solve this problem using local transactions. You will also see that this solution can cause in some cases, message duplication (for example, when ...

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You’re Very Likely to Have Gotten SQL Date Time Arithmetic Wrong!

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You’re very likely to have gotten SQL date time arithmetic wrong. And why is that? Google it! You’ll quickly find blog posts like these: Date / Time Arithmetic with Oracle 9 / 10 How does one add a day/hour/minute/second to a date value? Orace Date Arithmetic Tips And they’re all advocating stuff like this: SYSDATE + (10/1440) is ten minutes ...

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Java 8 Type Annotations

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Lambda expressions are by far the most discussed and promoted feature of Java 8. While I agree that Lambdas are a large improvement I think that some other Java 8 feature go a bit short because of the Lambda hype. In this post I want to show a number of examples from another nice Java 8 feature: Type Annotations. Type ...

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Transparent PATCH support in JAX-RS 2.0

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The PATCH method is one the the less well loved HTTP methods simple because until recently there really wasn’t a standard PATCH format. This has been standardized for JSON for a while now so there are quite a few libraries that will do the heavy lifting for you. For the purposes of this blog I am going to use json-patch ...

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The best code coverage for Scala

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The best code coverage metric for Scala is statement coverage. Simple as that. It suits the typical programming style in Scala best. Scala is a chameleon and it can look like anything you wish, but very often more statements are written on a single line and conditional “if” statements are used rarely. In other words, line coverage and branch coverage ...

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