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cjmx: A command-line version of JConsole


JConsole is a nice tool when it comes to monitoring a running Java application. But when it is not possible to connect to a JVM with JConsole directly (due to network restrictions for example) and SSH tunneling is not possible, then it would be great to have a command line version of JConsole. jcmx is such a command line version ...

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Java 8 StringJoiner


At the release of Java 8 the most attention went to the Lamda’s, the new Date API and the Nashorn Javascript engine. In the shade of these, there are smaller but also interesting changes. Amongst them is the introduction of a StringJoiner. The StringJoiner is a utility to delimit a list of characters or strings. You may recognize the code below: ...

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jOOQ Tuesdays: Yalim Gerger brings Git to Oracle


We’re excited to launch a new series on our blog: the jOOQ Tuesdays. In this series, we’ll publish an article on the third Tuesday every month where we interview someone we find exciting in our industry from a jOOQ perspective. This includes people who work with SQL, Java, Open Source, and a variety of other related topics. We have the ...

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Managing Package Dependencies with Degraph


A large part of the art of software development is keeping the complexity of a system as low as possible. But what is complexity anyway? While the exact semantics vary quite a bit, depending on who you ask, probably most agree that it has a lot to do with the number of parts in a system and their interactions. Consider ...

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R: Time to/from the weekend


In my last post I showed some examples using R’s lubridate package and another problem it made really easy to solve was working out how close a particular date time was to the weekend. I wanted to write a function which would return the previous Sunday or upcoming Saturday depending on which was closer. lubridate’s floor_date and ceiling_date functions make ...

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R: Cleaning up and plotting Google Trends data


I recently came across an excellent article written by Stian Haklev in which he describes things he wishes he’d been told before starting out with R, one being to do all data clean up in code which I thought I’d give a try.                 My goal is to leave the raw data completely ...

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EAGER fetching is a code smell


Introduction Hibernate fetching strategies can really make a difference between an application that barely crawls and a highly responsive one. In this post I’ll explain why you should prefer query based fetching instead of global fetch plans. Fetching 101 Hibernate defines four association retrieving strategies:     Fetching Strategy Description Join The association is OUTER JOINED in the original SELECT ...

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Spring MVC 4 Quickstart Maven Archetype Improved


Spring Boot allows getting started with Spring extremely easy. But there are still people interested in not using Spring Boot and bootstrap the application in a more classical way. Several years ago, I created an archetype (long before Spring Boot) that simplifies bootstrapping Spring web applications. Although Spring Boot is already some time on the market, Spring MVC 4 Quickstart ...

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Playing With Java Concurrency


Recently I needed to transform some filet that each has a list (array) of objects in JSON format to files that each has separated lines of the same data (objects). It was a one time task and simple one. I did the reading and writing using some feature of Java nio. I used GSON in the simplest way. One thread ...

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