Tag ‘Java’

Controlling GC pauses with the GarbageFirst Collector

In the previous post I have shown that the GarbageFirst (G1) collector in Java 7 (and also 8ea) does a reasonable job but cannot reach the GC throughput of the “classic” collectors as soon as old generation collections come about. This article focuses on G1’s ability to control the duration of GC pauses. To this end, I refined my benchmark from the previous tests and also ran it with a huge heap size of 50 GB for which G1 was designed. I learnt that G1’s control of GC pauses is not only costly but, unfortunately, also weaker than expected.

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Benchmarking G1 and other Java 7 Garbage Collectors

As mentioned in a first post of this series, Oracle’s GarbageFirst (G1) collector has been a supported option in Java 7 for some time. This post examines in more detail the performance of the G1 garbage collector compared to the other collectors available in the Hotspot JVM. I used benchmark tests for this purpose instead of a real application because they can be executed and modified more easily. I found surprising strengths and weaknesses in several of Hotspot’s garbage collectors and even disclose a fully-fledged bug.

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Daemonize your Java application with the “Fat Controller”

The Fat Controller is a parallel execution handler that repeatedly runs other programs, a bit like cron and Apache Daemon. It is simple to use yet has some nice features that makes it a great tool for simple and complex background processing tasks. The software is Open Source and licensed under GNU GPL v3.

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Designing and Implementing our Camel-based mgm Cosmo Router

We recently finished a subproject to integrate our mgm Cosmo insurance software with an external CRM system. Both systems had to exchange XML documents in a reliable and robust manner in order to keep their data in sync. We used Apache Camel as the middleware to handle all the transfers between the Java and .NET based systems. This blog series discusses our solution and shares our experiences with Apache Camel.

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Tuning Garbage Collection for Mission-Critical Java Applications

I recently had the opportunity to test and tune the performance of several shop and portal applications built with Java and running on the Sun/Oracle JVM, among them some of the most visited in Germany. In many cases garbage collection is a key aspect of Java server performance. In the following article we take a look at the state-of-the-art advanced GC algorithms and important tuning options and compare them for diverse real-world scenarios.

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How KICKZ uses Facebook for a better Customer Experience

The KICKZ online store is our latest e-commerce project that has gained a deep integration with Facebook. This blog article presents the four ways to utilize Facebook for a better and smoother customer experience. First we show how customers can use their Facebook accounts for registration and login into the online store using the OAuth 2.0 protocol. Next we discuss accessing the customer data from Facebook’s Open Graph (if user’s permission is given) in order to prefill registration and order forms. And finally, we deal with product reviews and forwarding customer Facebook posts to the Facebook wall of the online store.

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PL/SQL Unit Testing with DBUnit

My colleague Slavomír Jeleň and I are currently working on a logistics management application for an international food retailer. It’s a data-oriented application that performs pre-calculation steps on billions of rows with PL/SQL stored procedures. In order to ensure the correctness of these calculations, we devised a solution for unit testing the stored procedures in Oracle based on DBUnit.

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Possibly the most malicious Regular Expression

This is the next of my episode on regular expressions. Today, we look at the worst regex you can possibly come up with, although it looks innocent and simple. You will learn about this backtracking trap that let’s you easily wait for 10^30 steps, as an example of an errant email regex will illustrate. One possible solution we investigate is the use of possessive quantifiers.

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Regular Expressions: Splitting Pipes

It’s a common saying in IT: “I had a problem and used regular expressions to solve it. Now I’ve two problems”. We want to offer help in a series of mgm “Hacking Java Puzzler” blog entries and demonstrate how regular expressions can be useful anyway. In this first episode we will focus on splitting CSV lines.

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Consequences when using Mutable Fields in hashCode()

We start our new series with an informative HashSet puzzler. It’s about a bug that gave us quite a headache since its root cause was hard to identify. This subtle bug has without doubt crept into many code bases, so a detailed discussion should interest every Java coder. I will also discuss code inspection tools that detect this violation (sadly, only few). And by the way, what we learned about HashSet also makes a good topic in our job interviews.

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Rapid Prototyping with Spring Roo

Spring Roo, a new contender to Grails and Ruby on Rails, provides flexible scaffolding for Spring based applications. We used Spring Roo in a web project to quickly provide working software in order to discuss features and gather feedback. This article shows how we generated an early prototype and transitioned to early development and then to production code.

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Test-driving XForms with Orbeon

In this second installment, we conclude our evaluation of XForms implementations and explain why we ultimately preferred the Orbeon engine. I walk you through a XForms sample to explain essential concepts. My team has spent quite a lot of time understanding the Orbeon architecture and I discuss our findings, including separate-deployment configuration and state handling.

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Setting up Hudson for small Teams

Our Java project team has only three developers. We liked the idea to have our tests and builds run automatically and to have a central dashboard. However, we didn’t want to invest much time and expected a continuous integration server to be overkill. But as we started to play around with Hudson, we were quite amazed: the system was up in 5 minutes, including builds, tests, and e-mail notification.

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Effective Coding with IntelliJ IDEA

At our recent Java User Group Munich (JUGM) meeting, Vaclav Pech from JetBrains has demonstrated his company’s powerful Java/Groovy/Web IDE IntelliJ IDEA 9 and shared several not-so-obvious gems with us.

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