[12] 8206403: ByteArrayOutputStream hugeCapacity method can return invalid capacity

[Brian Burkhalter]

On Jul 23, 2018, at 5:26 PM, Martin Buchholz <martinrb at google.com> wrote:

> I'm the author of most of the MAX_ARRAY_SIZE code in the jdk.
> We should be as consistent as we can given the history.

Thanks for the history lesson.

> It all looks pretty similar.

There are in fact a number of them in java.base:

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/io/ByteArrayOutputStream.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/lang/AbstractStringBuilder.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/AbstractCollection.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/ArrayDeque.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/ArrayList.java

    static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/concurrent/ConcurrentHashMap.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/concurrent/PriorityBlockingQueue.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/Hashtable.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/PriorityQueue.java

    static final long MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/stream/Nodes.java

    private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
src/java.base/share/classes/java/util/Vector.java

> So unsurprisingly I prefer the status quo.

I am wondering whether MAX_ARRAY_SIZE is even still necessary in current VMs? I don’t know the low level details enough to comment on that.

Thanks,

Brian