About Lukas Eder

Lukas is a Java and SQL enthusiast developer. He created the Data Geekery GmbH. He is the creator of jOOQ, a comprehensive SQL library for Java, and he is blogging mostly about these three topics: Java, SQL and jOOQ.

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Deep Stack Traces Can be a Sign for Good Code Quality

The term “leaky abstractions” has been around for a while. Coining it is most often attributed to Joel Spolsky, who wrote this often-cited article about it. I’ve now stumbled ...
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Oracle GlassFish, or Why You Should Think About Open Source Again

Oracle’s recent announcement about the discontinuation of commercial services for JEE’s reference implementation GlassFish has caused many reactions in the community involved with ...
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ID Lists Aren’t the Best Solution for the N+1 Problem

In their eternal attempts to circumvent the N+1 problem, Hibernate users often resort to IN predicates with ID lists. In this post, we’ll see how those users might just be replacing ...
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The Code That Made me Cry

A friend of mine recently told me about the kind of problems he’s currently struggling with in the legacy application he’s maintaining. Here’s a sample piece of code to illustrate ...
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Top 10 Lists of Common Java Mistakes (That Makes Top 100!)

Top 10 lists are very popular, fun, and informative to read. But there are so many of them! How to choose the right one? Here’s a meta top 10 list helping you find the top 10 top ...
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Does Java 8 Still Need LINQ? Or is it Better than LINQ?

LINQ was one of the best things that happened to the .NET software engineering ecosystem in a long time. With its introduction of lambda expressions and monads in Visual Studio 2008, ...
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Why Staying in Control of Your SQL is so Important

Lots of blog posts and research papers are written about the topics of scaling up and scaling out. This interesting blog post, for instance, sheds some light on the two strategies with ...
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Top 5 Useful Hidden Eclipse Features

Eclipse is a beast. A device whose mystery is only exceeded by its power. Some would call it a continuum transfunctioner. Others would call it a transmogrifier. Yes, it is so huge, ...
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Add Some Entropy to Your JVM

Being able to generate true random numbers depends on the entropy in your system. Some claim, that this can be guaranteed by fair dice roll. Others think that replacing the OpenJDK’s ...
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SQL Trick: row_number() is to SELECT what dense_rank() is to SELECT DISTINCT

The SQL:2003 standard ranking functions are awesome companions and useful tools every now and then. The ones that are supported in almost all databases are:ROW_NUMBER(): This one ...
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