On 8/27/21 3:25 PM, David Holmes wrote:
Is this something that should be looked into or it can be safely ignored
(from JDK users POV)?
That is the unfortunate but expected trade-off from the Compact Strings work in JDK 9. That reworked
the String storage to hold byte[] instead of char[]. When String is in non-Latin1 mode, then 1
character is placed in 2 bytes. But since both arrays can only hold ~2^32 elements, it means that
the effective size for a String is twice lower than it used to.
$ jdk11u-dev/bin/java TestSB
Error occurred at length=1073741822 [i=1048575, j=1022]
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size
exceeds VM limit
If you keep the String* in Latin1, then the limit is the same at it "used to be", because every
character takes 1 byte:
- sb.append((char) j);
+ sb.append((char) (j & 0xFF));
$ jdk11u-dev/bin/java TestSB
Error occurred at length=2147483645 [i=2097151, j=1021]
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size
exceeds VM limit
--
Thanks,
-Aleksey
