title: slf4j logging with jdk – how to enable debug?
body: <p>By default slf4j, when using with jdk (<em>slf4j-jdk14-1.6.1.jar</em>), does not log debug messages.
  How do I enable them?</p>
  
  <p>I can’t find info neither in the official docs, the web or here on how to enable it.</p>
  
  <p>I found some info on (failed though) creating a file in %JDK_HOME%/lib and defining the level there, in a config file.
  However, I would like to define the level at compile-/run-time so I can both run and debug my app from my IDE with different logging levels.</p>
  
  <p>Isn’t there some environment variable I can set, or VM arg?</p>