Maybe you know the situation: you are developing a web application using the Maven build system along with an application server like Tomcat or Jetty and a corresponding plugin (e.g. the all famous jetty-maven-plugin).

One of the coolest features of these containers is the hot-deployment.

However, every second time a hot deployment is executed, it crashes due to a PermGen space Exception or a similar OutOfMemoryException.

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I’ve recently spent some hours to track down a mysterious bug and I just couldn’t find it. Since my application is using a lot of Threads/Workers it came to my mind that a RuntimeException I did not catch could be the cause. I wrote a global handler for it and found where the problem was :)

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