Tag Archives: server

“Cannot fork”

Posted on September 4, 2011 by

From time to time, the virtual server I rented acted up. When logging into the system, I would get error messages indicating the server wasn’t able to create any more processes: “cannot fork”. This was weird because ps(1) showed only … 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 →

Posted in java | Tagged , , | 2 Comments

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

Deploying to Tomcat From Maven Builds

Posted on March 1, 2011 by

It’s quite common to deploy web applications from a nightly continuous integration job to a testing server. In my case, I want to deploy a Java web application to a remote Tomcat server from a Maven build. Enter Cargo, a … Continue reading →

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Berlin Buzzwords Conference 2010

Posted on June 9, 2010 by

This week I attended Berlin Buzzwords Conference 2010, a two-day event aimed at software developers. The conference offered two tracks, one on search and the other one on NoSQL systems. Typical attendees seemed to be MacBook-wielding, twittering lifestyle geeks, often … Continue reading →

Posted in misc | Tagged , , , | 4 Comments

Using TCP for Low-Latency Applications

Posted on March 14, 2010 by

Last week I ran into a nasty little problem while implementing an application with soft real-time requirements. I was aiming at 1 ms or less for a TCP-based request-response roundtrip on a local network. Should be trivial, but why did … Continue reading →

Posted in misc | Tagged , , , | 13 Comments