Very odd exception

[Timothy Reaves]

        Hello.

        When I run the attached code, I often (as often as 50%) get the 
following, which I've never seen before:


[treaves@double BoxMaintenance]$ java TestString
String == rkmmDBV6
String length == 8


****************
Another exception has been detected while we were handling last error.
Dumping information about last error:
ERROR REPORT FILE = (N/A)
PC                = 0x0x4161903e
SIGNAL            = 11
FUNCTION NAME     = (N/A)
LIBRARY NAME      = (N/A)
Please check ERROR REPORT FILE for further information, if there is any.
Good bye.
[treaves@double BoxMaintenance]$


        I am running Sun's jdk1.3.1rc2 an a RH modified system, 2.4.4 kernel, 512 
meg memory.  Any ideas?

import java.security.SecureRandom;

public class TestString{
        public static void main(String[] args){
                SecureRandom rng = new SecureRandom();
                byte[] array = new byte[1];
                int index = 0;
                String testString = null;
                char testChar;
                StringBuffer buffer = new StringBuffer();
                do {
                        rng.nextBytes(array);
                        try{
                                testChar = new String(array, "US-ASCII").charAt(0);
                        } catch(Exception e){
                                continue;
                        }
                        if (Character.isLetterOrDigit(testChar)) {
                                buffer.append(testChar);
                                if (buffer.length() == 8) {
                                        break;
                                }
                        }
                } while ( true );

                String string = buffer.toString();
                System.out.println("String == " + string);
                System.out.println("String length == " + string.length());

        }

}