Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8016017

ArrayIndexOutOfBoundsException when trying to create a String from codePoints

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Won't Fix
    • Affects Version/s: 6u33
    • Fix Version/s: None
    • Component/s: core-libs
    • Labels:

      Description

      FULL PRODUCT VERSION :
      java version " 1.6.0_33 "
      Java(TM) SE Runtime Environment (build 1.6.0_33-b04)
      Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Linux XXXXXXXX 2.6.32.26-175.fc12.x86_64 #1 SMP Wed Dec 1 21:39:34 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
      Darwin YYYYYYYY 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64


      A DESCRIPTION OF THE PROBLEM :
      Attempting to construct a String given a larger integer array of Unicode code points such that the code points require surrogate pairs for Java's internal representation, fails with an ArrayIndexOutOfBoundsException for larger (>2048) odd-numbered input array lengths.

      Exception in thread " main " java.lang.ArrayIndexOutOfBoundsException: 2051
      at java.lang.Character.toSurrogates(Character.java:2596)
      at java.lang.String.<init>(String.java:285)
      at BugReport.main(BugReport.java:7)

      This problem has been reported by someone else as bug id#6588260 but was apparently closed unfixed.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1) Create an odd-numbered integer array larger than 2048 elements.
      2) Fill the array with *valid* Unicode code points larger than 0xFFFF.
      3) Pass the array to a String contructor that also takes offset and size.


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      A String representing the input Unicode code points.

      ACTUAL -
      java.lang.ArrayIndexOutOfBoundsException

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Exception in thread " main " java.lang.ArrayIndexOutOfBoundsException: 2051
      at java.lang.Character.toSurrogates(Character.java:2596)
      at java.lang.String.<init>(String.java:285)


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      public class BugReport {
        public static void main(String[] args) {
          for ( int i=2048; i<2100; ++i ) {
            int[] codePoints = new int[i];
            for ( int j=0; j<i; ++j ) codePoints[j] = 0x24B24; // CJK
            try {
      final String kaboom = new String( codePoints, 0, i );
            } catch (ArrayIndexOutOfBoundsException e) {
      System.out.println(String.format( " %d does not work " ,i));
            }
          }
        }
      }

      ---------- END SOURCE ----------

        Attachments

          Activity

            People

            Assignee:
            robm Robert Mckenna
            Reporter:
            webbuggrp Webbug Group
            Votes:
            0 Vote for this issue
            Watchers:
            3 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved: