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From "Vladimir Ivanov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-790) [classlib][math] unexpected ArrayIndexOutOfBoundsException for BigInteger.isProbablePrime(110)
Date Thu, 06 Jul 2006 13:32:29 GMT
[classlib][math] unexpected ArrayIndexOutOfBoundsException for BigInteger.isProbablePrime(110)
----------------------------------------------------------------------------------------------

         Key: HARMONY-790
         URL: http://issues.apache.org/jira/browse/HARMONY-790
     Project: Harmony
        Type: Bug

  Components: Classlib  
    Reporter: Vladimir Ivanov


The Harmony method java.math.BigInteger.isProbablePrime(110) throws ArrayIndexOutOfBoundsException
while RI returns correct value.

================= test.java ======================
import java.math.BigInteger;
import java.util.Random;

public class test {
   public static void main(String args[] ) {
           BigInteger bi = new BigInteger(9, 9, new Random());
           try {
                bi.isProbablePrime(109);
                System.out.println("uncertainty = 109, passed");
           } catch (ArrayIndexOutOfBoundsException e) {
                System.out.println("uncertainty = 109, failed: " + e);
	   }
           try {
               bi.isProbablePrime(110);
               System.out.println("uncertainy = 110, passed");
           } catch (ArrayIndexOutOfBoundsException e) {
               System.out.println("uncertainty = 110, failed: " + e);
	       e.printStackTrace();
           }
           try {
               bi.isProbablePrime(110);
               System.out.println("uncertainy = 500, passed");
           } catch (ArrayIndexOutOfBoundsException e) {
               System.out.println("uncertainty = 500, failed: " + e);
           }
    }
}
==============================================

Output:
C:\tmp\tmp17>C:\jrockit-jdk1.5.0-windows-ia32\bin\java.exe -showversion test
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
BEA WebLogic JRockit(R) (build dra-38972-20041208-2001-win-ia32, R25.0.0-75, GC: System optimized
over throughput (initial strategy singleparpar))

uncertainty = 109, passed
uncertainy = 110, passed
uncertainy = 500, passed

C:\tmp\tmp17>C:\harmony\trunk_0427\deploy\jdk\jre\bin\java.exe -showversion test
java version 1.5 (subset)

(c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
uncertainty = 109, passed
uncertainty = 110, failed: java.lang.ArrayIndexOutOfBoundsException: Array index out of range:
54
java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 54
        at java.math.BigInteger.isProbablePrime(BigInteger.java:1739)
        at test.main(test.java:14)
uncertainty = 500, failed: java.lang.ArrayIndexOutOfBoundsException: Array index out of range:
54


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