[draven]

I stare hard at the code to build a mental image of what it's doing. I then use logs to check if what I think is happening is actually happening (including logging a stack trace when I want to make sure how the program gets there.)

I tend to use a debugger when I start to log too many things. It's a sign I should use a debugger to run the code, stop the execution where I'd put the logs and then explore the context and stack trace.

I also use Emacs (I'm mainly a Scala dev) and still fire up Intellij for debugging most of the time.