FULL PRODUCT VERSION :
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28 05:14:15 UTC 2010 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
NumberFormat.getNumberInstance() returns a NumberFormat instance that uses RoundingMode.HALF_EVEN as its default rounding method.
This is IMHO not a general-purpose number format since rounding values like 10.5d will result to 10 instead of 11!
The default rounding method should be RoundingMode.HALF_UP!

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the simple example

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
see example
ACTUAL -
see example

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
     NumberFormat nf = NumberFormat.getNumberInstance(); // same using static method taking Locale
     ((DecimalFormat)nf).applyPattern("#0"); // round
// nf.setRoundingMode(RoundingMode.HALF_UP);
     System.err.println("12.5: "+nf.format(12.5d)+", but should be 13!");
     System.err.println("11.5: "+nf.format(12.5d)+", ok");

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
setRoundingMode(RoundingMode.HALF_UP);

SUPPORT :
YES