Use multiple resource folders for your Java libraries if you need to limit library usage to specific channels or if you have many Java libraries.

(Settings > Resources) Avoid putting all of your custom Java libraries in the Default Resource folder ("custom-lib"). You may have added a particular Java library to be used by a single channel. If so, place that library into a separate resource and enable that resource for that one channel under the "Dependencies" section of the Channel Properties. A danger of having too many libraries in the default resource is that unexpected runtime conflicts could occur between different libraries.