IDE not showing console log

Hello everyone, I'm running a Web Application. 

It's a website and I was testing if a form would connect to the database etc. It doesn't work, but it seems I cannot get the stacktrace of the error, because I cannot see any console in the IDE or any file written outside the IDE, like in Apache Tomcat Folder or IntelliJ log folder.

I just want a console with the stacktrace printed or any other printed line that I use for "debug" my code.

Thanks to anyone who's answering me.