FULL PRODUCT VERSION :
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
OS X 10.12.6

A DESCRIPTION OF THE PROBLEM :
 java.text.NumberFormat.getInstance(new Locale("fi", "FI")).parse("1,5") => 1.5 (correct)

 java.text.NumberFormat.getInstance(new Locale("fi", "FI")).parse("-1,5") => java.text.ParseException thrown: Unparseable number: "-1,5" (at NumberFormat.parse (NumberFormat.java:393))

The latter should produce -1.5

REGRESSION. Last worked in version 8u144

ADDITIONAL REGRESSION INFORMATION:
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :

 java.text.NumberFormat.getInstance(new Locale("fi", "FI")).parse("-1,5")

Should produce: -1.5
Produces: ParseException (see Description)


ACTUAL -
java.text.ParseException thrown: Unparseable number: "-1,5"
at NumberFormat.parse (NumberFormat.java:393)
at (#4:1)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
 java.text.NumberFormat.getInstance(new Locale("fi", "FI")).parse("-1,5")
---------- END SOURCE ----------