FULL PRODUCT VERSION :
java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b118)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b60, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux Studio-XPS-9100 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
A NumberFormat object with the RoundingMode set to HALF_EVEN rounds correctly in jdk 1.7, but no longer rounds in jdk 1.8.
Code for a test case is given in the Steps to Reproduce


REGRESSION. Last worked in version 7u40

ADDITIONAL REGRESSION INFORMATION:
Broken version:
java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b118)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b60, mixed mode)


Previous, working version:
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The following test will print "55.6%" in jdk 1.7 (which is correct) but will print "55.5%" in jdk 1.8 (incorrect).

import java.text.NumberFormat;
import java.math.RoundingMode;
public class NumberFormatTest {
    public static void main(String[] args) {
        NumberFormat percent = NumberFormat.getPercentInstance();
        percent.setMinimumFractionDigits(1);
        percent.setMaximumFractionDigits(1);
        percent.setRoundingMode(RoundingMode.HALF_EVEN);
        System.out.println(0.5555);
        System.out.println(percent.format(0.5555));
    }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
print "55.6%"
ACTUAL -
prints "55.5%"

REPRODUCIBILITY :
This bug can be reproduced always.