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Java 8’s Method References Put Further Restrictions on Overloading


Method overloading has always been a topic with mixed feelings. We’ve blogged about it and the caveats that it introduces a couple of times: You Will Regret Applying Overloading with Lambdas! Keeping things DRY: Method overloading Why Everyone Hates Operator Overloading API Designers, be Careful There are two main reasons why overloading is useful: To allow for defaulted arguments To ...

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4 out of 5 Java Developers Failed to Solve This Question


Results from the Java Deathmatch – A puzzle minigame for developers A few months ago we released a new side project of ours with a minisite called Java Deathmatch, and since then over 20,000 developers have given it a try. The site features 20 multiple-choice Java questions and today after we’ve gathered stats from all the games that have been ...

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Is using Unsafe really about speed or functionality?


Overview Around 6 years ago, I started using a class which up to that point was just a curiosity sun.misc.Unsafe.  I had used it for deserialization and re-throwing Exceptions but not used all it’s capabilities or talked about it publicly. The first open source library I saw which did use Unsafe in a serious way was Disruptor. This encouraged me ...

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Java Numeric Formatting: DecimalFormat


In the post Java Numeric Formatting, I described and demonstrated some of the useful instances provided by NumberFormat static methods such as NumberFormat.getNumberInstance(Locale), NumberFormat.getPercentInstance(Locale), NumberFormat.getCurrencyInstance(Locale), and NumberFormat.getIntegerInstance(Locale). It turns out that all of these instances of abstract NumberFormat are actually instances of DecimalFormat, which extends NumberFormat. The next code listing and the associated output demonstrate that all instances returned by ...

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Extending PostgreSQL: Complex Number Data Type


A few years ago I discussed creating user-defined types using PL/java. (Introduction to PostgreSQL PL/Java, part 4: User Defined Types) Today I follow up on the comment that we would use a standard C-language PostgreSQL extension in practice. What is an extension? A PostgreSQL extension is nothing more than bundled SQL statements and an optional native library. SQL-only extensions contain ...

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FREE IntelliJ IDEA Licenses Giveaway from Java Code Geeks and JetBrains (total value of $597)!


Looking for a powerful, yet simple, Java IDE ? Then we have something especially for you! We are running a contest giving away FREE licenses for the kick-ass IntelliJ IDEA IDE. The Most Intelligent Java IDE. Excel at enterprise, mobile and web development with Java, Scala and Groovy, with all the latest modern technologies and frameworks available out of the ...

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5 Reasons You Should Stop Hosting Your ELK Stack Locally


The hosted ELK stack: Centralizing and managing your logs for fun and profit You don’t look a gift-horse in the mouth. Especially if it’s not a horse and actually an elk. It will poke you with its antlers. Or get drunk on fermented apples and trash your backyard. That’s an occupational hazard we’re willing to accept though so let’s take ...

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Scaling and Load Balancing WildFly on OpenShift v3 With Fabric8


Did you enjoy the first ride with Fabric8 and OpenShift v3? There’s more a lot more to come. After we got the first WildFly container up and running on Kubernetes, without having to deal with all it’s inherent complexity, I think it is about time to start to scale and load balance WildFly. Prerequisites Make sure, you have the complete ...

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ActiveMQ as a Message Broker for Logstash


When scaling Logstash it is common to add a message broker that is used to temporarily buffer incoming messages before they are being processed by one or more Logstash nodes. Data is pushed to the brokers either through a shipper like Beaver that reads logfiles and sends each event to the broker. Alternatively the application can send the log events ...

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