ADDITIONAL SYSTEM INFORMATION :
I tried 3 different versions, I see the bug everytime.

Oracle JDK15 :
java version "15" 2020-09-15
Java(TM) SE Runtime Environment (build 15+36-1562)
Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)

OpenJDK 11 :
openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10-post-Ubuntu-0ubuntu120.04)
OpenJDK 64-Bit Server VM (build 11.0.8+10-post-Ubuntu-0ubuntu120.04, mixed mode)

OpenJDK 8 :
openjdk version "1.8.0_265"
OpenJDK Runtime Environment (build 1.8.0_265-8u265-b01-0ubuntu2~20.04-b01)
OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)

A DESCRIPTION OF THE PROBLEM :
When trying to allocate an array bigger than the heap, I expect an OOM error thrown with the "Requested array size exceeds VM limit" message, but I get a "Java heap space" message instead.

Documentation : https://docs.oracle.com/en/java/javase/11/troubleshoot/troubleshoot-memory-leaks.html#GUID-19F6D28E-75A1-4480-9879-D0932B2F305B


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Allocate a big array of 800 MB but restrict the heap size to 100 MB. The OutOfMemoryError is thrown, but it's the wrong message.

Command :
java -Xmx100m MemOverflow

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Heap max size: 100MB
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit
    at MemOverflow.main(MemOverflow.java:5)
ACTUAL -
Heap max size: 100MB
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at MemOverflow.main(MemOverflow.java:5)

---------- BEGIN SOURCE ----------
public class MemOverflow {

    public static void main(final String[] args) {
        System.out.println("Heap max size: " + (Runtime.getRuntime().maxMemory() / 1024 / 1024) + "MB");
        long[] array = new long[100_000_000]; // ~800MB
        System.out.println(array.length);
    }
}
---------- END SOURCE ----------

FREQUENCY : rarely