FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b116)
Java HotSpot(TM) Client VM (build 20.0-b02, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Versione 6.1.7600]

A DESCRIPTION OF THE PROBLEM :
using the format strring "%1$#8s" throws a FormatFlagsConversionMismatchException on Jdk7, on jdk6 there is no error

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
public static void main(String .... args) {
   long l = 1000;
   String length = String.format("%1$#8s", (Long)l);
}

simply run it...



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no exception
ACTUAL -
Exception in thread "main" java.util.FormatFlagsConversionMismatchException: Conversion = s, Flags = #
        at java.util.Formatter$FormatSpecifier.failMismatch(Formatter.java:4019)
        at java.util.Formatter$FormatSpecifier.printString(Formatter.java:2812)
        at java.util.Formatter$FormatSpecifier.print(Formatter.java:2696)
        at java.util.Formatter.format(Formatter.java:2472)
        at java.util.Formatter.format(Formatter.java:2400)
        at java.lang.String.format(String.java:2845)
        at mysft.TestFormat.main(TestFormat.java:15)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.util.FormatFlagsConversionMismatchException: Conversion = s, Flags = #
        at java.util.Formatter$FormatSpecifier.failMismatch(Formatter.java:4019)
        at java.util.Formatter$FormatSpecifier.printString(Formatter.java:2812)
        at java.util.Formatter$FormatSpecifier.print(Formatter.java:2696)
        at java.util.Formatter.format(Formatter.java:2472)
        at java.util.Formatter.format(Formatter.java:2400)
        at java.lang.String.format(String.java:2845)
        at mysft.TestFormat.main(TestFormat.java:15)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public static void main(String .... args) {
   long l = 1000;
   String length = String.format("%1$#8s", (Long)l);
}

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

SUPPORT :
YES