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  1. JDK
  2. JDK-8258565

ArrayList.ensureCapacity specification missing maximum capacity

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    Details

    • Type: Enhancement
    • Status: New
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 8
    • Fix Version/s: None
    • Component/s: core-libs

      Description

      ADDITIONAL SYSTEM INFORMATION :
      Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=gasp
      java version "1.8.0_151"
      Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
      Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

      A DESCRIPTION OF THE PROBLEM :
      Javadoc of method ArrayList.ensureCapacity does not restrict the capacity of the ArrayList. Sample program:

      public class A {
         public static void main(String args[]) {
            ArrayList al = new ArrayList();
            al.ensureCapacity(Integer.MAX_VALUE);
         }
      }

      Steps to reproduce:

      1. Compile above program
      2. Run it using Oracle HotSpot java

      Current result:

      Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit
      at java.util.Arrays.copyOf(Arrays.java:3210)
      at java.util.Arrays.copyOf(Arrays.java:3181)
      at java.util.ArrayList.grow(ArrayList.java:265)
      at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:239)
      at java.util.ArrayList.ensureCapacity(ArrayList.java:219)
      at A.main(A.java:6)

      Expected result:

      The ArrayList capacity increased by Integer.MAX_VALUE.


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              Assignee:
              Unassigned Unassigned
              Reporter:
              webbuggrp Webbug Group
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                Dates

                Created:
                Updated: