Tag Archives: java

Testing equals() with Guava

Posted on July 21, 2014 by

I’ve long held the opinion that Guava belongs on every Java classpath because its design and the quality of its implementation surpass other comparable utility libraries (and sometimes even the JDK). Guava’s testlib is pretty cool, too, even though it’s … Continue reading →

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Visualizing Package Dependencies

Posted on August 26, 2012 by

Managing module or package dependencies is an important design activity that helps to keep a software project maintainable. Visualizing these dependencies is a good way of getting a first impression on a project and for exposing design problems. In this … Continue reading →

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Maven Archetypes Updated!

Posted on July 1, 2012 by

Two years ago, I published a Maven archetype for Hadoop that turned out to be quite popular, judging from the comments I received and the access logs on my server. Today I’ve updated it to use the latest version of … Continue reading →

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Hudson vs. Jenkins Revisited

Posted on December 27, 2011 by

When the Hudson/Jenkins fork was announced earlier this year, the case seemed pretty clear. There were heroes from the Open Source community, among them Hudson’s original author, and there was everybody’s favorite villain, Oracle. Back in February, I would have … Continue reading →

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Writing Hamcrest Matchers

Posted on August 2, 2011 by

JUnit 4 introduced a fancy DSL based on the Hamcrest framework for expressing assertions. JUnit ships with the most important matchers and you can always add Hamcrest to your classpath if you need more. Sometimes no existing matcher fits your … Continue reading →

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JBoss: Running Multiple Instances on One Host

Posted on July 10, 2011 by

Occasionally, it’s useful to run multiple JBoss instances on one machine. Like with any network server, this is difficult because only one application can bind to a port at any given time. You have to assign different sets of ports … Continue reading →

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Excluding Pages From Authentication

Posted on April 17, 2011 by

Java’s Servlet spec allows web applications to delegate authentication and authorization to the servlet container, a mechanism known as container-based security. A lot of people use it for in-house applications or web services because it’s simple and containers like Tomcat … Continue reading →

Posted in java | Tagged , , , | 16 Comments

Enabling JMX Access on Tomcat

Posted on March 12, 2011 by

I think every Java application in production should enable JMX access. Without JMX, there’s little chance to debug JVM-level problems, especially those related to out of memory errors. Even if your application doesn’t export its own MBeans for monitoring, you … Continue reading →

Posted in java | Tagged , | 8 Comments