import java.nio.*;

public class X {

    public static void main (String[] args) {
CharSequence cs = CharBuffer.wrap("foo");
for (int i = 0; i < cs.length(); i++)
System.out.print(cs.charAt(i));
System.out.println();
    }

}

Running with the code that will be in build 82:

% /w/nio/build/bin/java -showversion X
java version "1.4.0-internal"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-internal-mr_29_sep_2001_09_44)
Java HotSpot(TM) Client VM (build 1.4.0-beta3-b81, mixed mode)

Exception in thread "main" java.lang.IndexOutOfBoundsException
        at java.nio.Buffer.checkIndex(Buffer.java:417)
        at java.nio.CharBuffer.charAt(CharBuffer.java:1108)
        at X.main(X.java:14)
%

This bug makes NIO character buffers unusable with the java.util.regex API and
with any other API that takes character sequences.

-- ###@###.### 2001/10/3