The implementation in statsmath.java results in an NumberFormatException when then LANG for the VM is set to another than EN:

Caused by: java.lang.NumberFormatException: For input string: "19,16"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at java.lang.Double.valueOf(Double.java:502)
at jenkins.plugins.build_metrics.stats.StatsMath.roundTwoDecimals(StatsMath.java:13)
at jenkins.plugins.build_metrics.stats.StatsMath.getPercent(StatsMath.java:8)
at jenkins.plugins.build_metrics.stats.StatsFactory.getFailureRate(StatsFactory.java:167)
... 135 more

Please change:
public static double roundTwoDecimals(double iVal)

{ DecimalFormat twoDForm = new DecimalFormat("#.##"); return Double.valueOf(twoDForm.format(iVal)); }

to:
public static double roundTwoDecimals(double iVal)

{ DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols(Locale.getDefault()); DecimalFormat twoDForm = new DecimalFormat("#"+decimalFormatSymbols.getDecimalSeparator()+"##",decimalFormatSymbols); return Double.valueOf(twoDForm.format(iVal)); }

Thanks