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OutOfMemoryError on overprovisioned heap

Why am I getting the OutOfMemoryError when allocating a data structure that should happily fit within the heap I have provided for the JVM? This was a question I recently faced. Indeed, ...
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Java 8 default methods can break your (users’) code

At first glance, default methods brought a great new feature to the Java Virtual Machine’s instruction set. Finally, library developers are able to evolve established APIs without ...
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JavaOne 2014 – Some First Analysis on Submissions

Time is running away these days. So many things happening in parallel and of course the most important Java conference is in the middle of everything. JavaOne 2014 closed the CfP doors ...
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Spring Integration 4.0: A complete XML-free example

1. Introduction Spring Integration 4.0 is finally here, and this release comes with very nice features. The one covered in this article is the possibility to configure an integration ...
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HOW-TO: Quartz Scheduler with Clustering in JEE application with MySQL

Quartz Scheduler is one of the most popular scheduling library in Java world. I had worked with Quartz mostly in Spring applications in the past. Recently, I have been investigating ...
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Choosing a fast unique identifier (UUID) for Lucene

Most search applications using Apache Lucene assign a unique id, or primary key, to each indexed document. While Lucene itself does not require this (it could care less!), the application ...
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Jax-RS custom exception handling

One of the nice things about working with JEE is the components available really are pretty standard.  While using JAX-RS, sometimes you need to control how exceptions get processed ...
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Too Fast, Too Megamorphic: what influences method call performance in Java?

Whats this all about then? Let’s start with a short story. A few weeks back I proposed a change on the a Java core libs mailing list to override some methods which are currently final. ...
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Apache Solr real-time live index updates at scale with Apache Hadoop

Episode # 22 of the podcast was a talk with Patrick Hunt We talked about the new work that has gone into Apache Solr (upstream) that allows it to work on Apache Hadoop. Solr has support ...
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Okay, everybody who touches Java bytecode

The Oracle v. Google holds that copying the Structure, Sequence, and Organization of the Java APIs is a copyright violation. And a copyright violation is not just the act of copying, ...
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