A DESCRIPTION OF THE PROBLEM :
A DecimalFormat with a mask containing percentage sign does not respect the rounding mode HALF_UP. This only happens when rounding up from zero to one. See reproduction.

REGRESSION : Last worked in version 21.0.9

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
String mask = "#%";

DecimalFormat df = new DecimalFormat();
df.setParseBigDecimal(true);

df.setRoundingMode(RoundingMode.HALF_UP);
df.applyPattern(mask);

System.out.println(df.format(new BigDecimal("0.005"))); //Outputs 0% (should be 1%)
System.out.println(df.format(new BigDecimal("0.015"))); //Outputs 2%
System.out.println(df.format(new BigDecimal("0.025"))); //Outputs 3%

---------- BEGIN SOURCE ----------
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;

public class DecimalFormatPercentageAroundZero {

public static void main(String[] args) {
String mask = "#%";

DecimalFormat df = new DecimalFormat();
df.setParseBigDecimal(true);

df.setRoundingMode(RoundingMode.HALF_UP);
df.applyPattern(mask);

System.out.println(df.format(new BigDecimal("0.005"))); //Outputs 0% (should be 1%)
System.out.println(df.format(new BigDecimal("0.015"))); //Outputs 2%
System.out.println(df.format(new BigDecimal("0.025"))); //Outputs 3%

}

//Java21 ok
//Java22 and up not ok
}
---------- END SOURCE ----------

FREQUENCY :
ALWAYS