06. Using Categories

If you have special groups of threads in your application or application environment, e.g. request pool threads, you can define custom thread dump categories for grouping these threads so you can easier access them if you want to check for specific data in these threads.

The Screenshot shows a custom category grouping all pool threads in an application using Java NIO as API to parse input stream data. A category consist of at least one filter. For this category a filter JCSNioFilter was defined which filters all these threads and which is inactive as default filter so it isn't applied to the other categories (default and custom ones). If a category doesn't contain any threads it is automatically hidden.