IV77747: JAVA.UTIL.ARRAYLIST.ADDALL LEADS TO JAVA.LANG.ARRAYINDEXOUTOFBOU NDSEXCEPTION IN CERTAIN SCENARIO

APAR status

• Closed as program error.

Error description

• Error Message: Exception in thread "main"
  java.lang.ArrayIndexOutOfBoundsException: Array index out of
  range: 12
      at java.util.ArrayList.addAll(ArrayList.java:254)
      at
  ArrayIndexOutOfBoundsExample.main(ArrayIndexOutOfBoundsExample.j
  ava:15)
  .
  Stack Trace: N/A
  .
  Exception occurs only with Java 6.0.0 and 6.1.0 with following
  scenario
  final List<Integer> nums = new ArrayList<Integer>();
  nums.addAll(0, Collections.<Integer> emptyList());
  nums.addAll(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
  12));
  

Local fix

Problem summary

• Inserting empty collection to empty java.util.ArrayList instance
  at 0th index modifies the metadata of List incorrectly. At this
  state, addition of elements from collection of size greater than
  capacity of java.util.ArrayList result in
  java.lang.ArrayIndexOutOfBoundsException.
  

Problem conclusion

• java.util.ArrayList has been modified to handle the case of
  adding empty collection at 0th index properly and avoid
  incorrect modification of metadata.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP20  (6.1.8.20)
     6    SR16 FP20 (6.0.16.20)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSY

     UP