FULL PRODUCT VERSION :
java version "1.6.0_27"
Java(TM) SE Runtime Environment (build 1.6.0_27-b07)
Java HotSpot(TM) 64-Bit Server VM (build 20.2-b06, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
This code throws an ArrayIndexOutOfBoundsException:

String.format("%3.0g", 0.0);

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The code above is 100% reliable. I tested it on 3 different machines.

ACTUAL -
ArrayIndexOutOfBoundsException

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Here's the stack trace:
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at java.util.Formatter$FormatSpecifier.addZeros(Formatter.java:3357)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:3251)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:3146)
at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2718)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2667)
at java.util.Formatter.format(Formatter.java:2433)
at java.util.Formatter.format(Formatter.java:2367)
at java.lang.String.format(String.java:2769)
...

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Source code to reproduce:
  String s = String.format("%3.0g", 0.0);

The code in error seems to be in java.util.Formatter$FormatSpecifier.addZeros:3357:
// Create new array with existing contents.
char[] tmp
= new char[v.length + prec - outPrec + (needDot ? 1 : 0)];
System.arraycopy(v, 0, tmp, 0, v.length);

If prec - outPrec + (needDot ? 1 : 0) > 0, it tries to copy too much, which throws the exception.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
round the double to a long and print that instead