Java by API/java.util.logging/LogManager

LogManager: addPropertyChangeListener(PropertyChangeListener l)

  
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.logging.LogManager;
public class Main {
  public static void main(String[] argv) throws Exception {
    // Register for the event
    LogManager.getLogManager().addPropertyChangeListener(new PropertyChangeListener() {
      // This method is called when configuration file is reread
      public void propertyChange(PropertyChangeEvent evt) {
        String propName = evt.getPropertyName();
        Object oldValue = evt.getOldValue();
        Object newValue = evt.getOldValue();
        // All values are null
      }
    });
  }
}