System.out.println() in Intellij Plugin

Hello Everyone, 

I have a bug in an Intellij plugin i have written, that only occurs if the plugin is installed (as opposed to running the plugin in debugger). So I need any means of debugging the plugin without using the debugger. 
My first thought was using the Notification API but for whatever reason it doesn't notify reliable. (Notifications that should be pushed just aren't). So my question is, is there a possibility to read out System.out.println in an installed plugin and if yes where? Or is there yet another option?