FULL PRODUCT VERSION :
Java 7, 8

A DESCRIPTION OF THE PROBLEM :
All Java API is quiet except the java.util.prefs.Preferences
which prints debug messages to stderr.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Remove ~/.java/.userPrefs directory
2. Run the attached test.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No debug messages.
ACTUAL -
Text printed to stderr:

lut 15, 2013 7:07:52 AM java.util.prefs.FileSystemPreferences$1 run
INFO: Created user preferences directory.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Test {
public static void main(String[] args) throws Exception {
java.util.prefs.Preferences.userRoot();
}
}
---------- END SOURCE ----------