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Searching Subversion Logs with Groovy


There are times when I want to quickly search a Subversion repository by author, by range of revisions, and/or by commit messages. Krzysztof Kotowicz has posted the blog post Grep Subversion log messages with svn-grep that introduces svn-grep, a bash script making use of the command line XML toolkit called xmlstarlet (xmlstarlet is also available on Windows). This is a ...

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Memory leaks and memory management in Java applications


One of the more prominent features of the Java platform is its automatic memory management. Many people translate this feature erroneously into there are no memory leaks in Java. However, this is not the case and I am under the impression that modern Java frameworks and Java-based platforms, especially the Android platform, increasingly contradict this erroneous assumption. In order to ...

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Big Data and R


This blog post is a presentation of tips on computing with Big Data in R, using Revolution R Enterprise 7.0 and RevoScaleR, Revolution’s R package for HPA computing, as introduced by Revolution Analytics blog. For more detailed information you can take a look at Tips on Computing with Big Data in R. 1 Upgrade your hardware Since bigger is better, ...

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Determining Presence of Characters or Integers in String with Guava CharMatcher and Apache Commons Lang StringUtils


A recent Reddit post asked the question, “Is there a predefined method for checking if a variable value contains a particular character or integer?” That question-based title was also asked a different way, “A method or quick way for checking if a variable contains any numbers say or (‘x’,2,’B’) like a list?” I am not aware of any single method ...

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Getting started with Apache Mesos and Apache Aurora using Vagrant


Apache Mesos is a cluster manager that provides efficient resource isolation and sharing across distributed applications, or frameworks. Think of it as the “kernel” for your data center. Paco Nathan talked about this on one of the All Things Hadoop Podcasts. Features:             Fault-tolerant replicated master using ZooKeeper Scalability to 10,000s of nodes Isolation between tasks ...

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Project Student: Webservice Server with Jersey


This is part of Project Student. Other posts are Webservice Client With Jersey, Business Layer and Persistence with Spring Data. The second layer of the RESTful webapp onion is the webservice server. It should be a thin layer that wraps calls to the business layer but does not do significant processing of its own. This post has a lot of ...

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Introduction To JUnit Theories


Have you ever read a mathematical theory? It typically reads something like this: For all a, b > 0  the following is true: a+b > a and a+b > b Just typically the statements are more difficult to understand. There is something interesting about this kind of statement: It holds for EVERY element (or combination of elements) of a rather ...

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Top 10 JavaCodeGeeks posts for 2013


2013 is coming to an end. What a year! Loyal to our tradition, we are compiling the top Java Code Geeks for the year that just passed. As with the Top 10 JavaCodeGeeks posts for 2010, the Top 10 JavaCodeGeeks posts for 2011 and the Top 10 JavaCodeGeeks posts for 2012, we have created a compilation with the most popular ...

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