FULL PRODUCT VERSION :
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
MacOS Sierra 10.12.4 (16E195)

A DESCRIPTION OF THE PROBLEM :
I have a code like:
srcObjs.parallelStream().forEach((src) -> {...}
where srcObjs is a list of custom objects.
We encounter null for 'src' consumer, random occurrences.
On debugging found that it is in ArrayList.ArrayListSpliterator.forEachRemaining(Consumer<? super E> action) method.
Line 1373 has: E e = (E) a[i];
where a is the Object[] pointing to elementData. The size of this array is greater than that of the array, and hence for some indices the values are null.

REGRESSION. Last worked in version 7u76


REPRODUCIBILITY :
This bug can be reproduced occasionally.

CUSTOMER SUBMITTED WORKAROUND :
Using java 7 for loop.