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Debugging the dreaded “SEVERE: Error listenerStart” and “SEVERE: Error filterStart” tomcat error messages

Just a quick post that I hope might benefit others. If you have been developing web applications on tomcat for a while you have likely come the two error messages mentioned in the title. SEVERE: Error listenerStart Occurs when an exception is thrown in the contextInitialized method of a ServletContextListener SEVERE: Error filterStart Occurs when an […]

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Decrease the double click speed for Java Applications on Ubuntu Linux

When running any Java swing application (like intellij idea) on Ubuntu the double click speed is by default set to 200ms. If like me you find this anoying you can decrease the double click speed by taking the following steps In your home directory create a file called .Xresources and add the following line *multiClickTime: […]

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Too many open files

Today I was asked to review a piece of code that a coworker of mine suspected was causing “Too many open files“ exceptions in a production environment The code looked innocuous enough. He was using ProcessBuilder to create and run an external application. Regardless I booted into Linux and ran some tests. Now on Linux […]

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Extensibility jBPM style

Currently I am involved in a project that is moving away from a proprietary workflow solution to a JBPM based workflow solution. One of the first things I attempted to do was try and make jBPM integrate with the identity management solution used in the project. I knew that jBPM comes packaged with some sort […]

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