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  1. JDK
  2. JDK-5050278

BigInteger constructor gives NegativeArraySizeException

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 1.4.2
    • Fix Version/s: 6
    • Component/s: core-libs
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b12
    • CPU:
      x86
    • OS:
      linux

      Description

      Name: rmT116609 Date: 05/19/2004


      FULL PRODUCT VERSION :
      java version "1.4.2_04"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
      Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

      java version "1.5.0-beta"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
      Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      Linux escher.nz.reeltwo.com 2.4.22-1.2140.nptl #1 Tue Jan 6 20:20:43 EST 2004 i686 i686 i386 GNU/Linux
      Solaris 2.9


      A DESCRIPTION OF THE PROBLEM :
      The constructor BigInteger(int numBits, Random rnd) fails with NegativeArraySizeException when numBits is Integer.MAX_VALUE. What it should do (according to the docs) is produce a BigInteger with 2^31-1 bits (i.e. a very large number).

      In fact sizes Integer.MAX_VALUE-1, Integer.MAX_VALUE-2, down to Integer.MAX_VALUE-6 also cause this problem. Integer.MAX_VALUE-7 works as expected.


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Calling the constructor with the indicated arguments causes the problem.
      The sample code below demonstrates the problem.



      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      I expect a random BigInteger with the specified number of bits to be constructed.
      ACTUAL -
      Exception.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      escher[sean]:src> !ja
      java -Xmx800m Bug
      Exception in thread "main" java.lang.NegativeArraySizeException
              at java.math.BigInteger.randomBits(BigInteger.java:471)
              at java.math.BigInteger.<init>(BigInteger.java:464)
              at Bug.main(Bug.java:7)


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.util.Random;
      import java.math.BigInteger;

      public class Bug {

        public static void main(String[] args) {
          BigInteger a = new BigInteger(Integer.MAX_VALUE, new Random());
        }
      }

      ---------- END SOURCE ----------
      (Incident Review ID: 270492)
      ======================================================================
      ###@###.### 10/21/04 01:45 GMT

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              • Assignee:
                darcy Joe Darcy
                Reporter:
                rmandalasunw Ranjith Mandala (Inactive)
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                  Updated:
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