This is happening in Pit Build-32 on Solaris.

coulpe of charset alias/canonical names that are supported
in java.io/java.lang are not supported in java.nio.charset
These are mentioned below:-
big5hk
unicode-1-1-utf-8
default
iso_8859-5:1988
iso_8859-13
ISO8859_15

For these if you run the code mentioned below:-
import java.nio.charset.*;


public class test {
    public static void main(String[] argv) {
        try{
            Charset c = Charset.forName(argv[0]);
            System.out.println(argv[0] + ": supported (" + c.name() +")");
        } catch(UnsupportedCharsetException uce) {
            System.out.println(argv[0] + ": NOT supported");
        }
    }
}

one can see the output NOT Supported.

N/A

ok , most but not all were added for 4784385.
This list of missing aliases should be added before 1.5 is completed.
  xxxxx@xxxxx   2003-12-10