As per the spec - https://download.java.net/java/early_access/jdk22/docs/api/java.base/java/lang/foreign/SegmentAllocator.html#allocate(java.lang.foreign.MemoryLayout,long)
Throws:
IllegalArgumentException - if elementLayout.byteSize() * count overflows

actually - java.lang.IndexOutOfBoundsException is thrown.


Is it a typo in the spec?

sample code

===
private void test01() {
        SegmentAllocator segmentAllocator = SegmentAllocator.prefixAllocator(MemorySegment.ofArray(new byte[4]));
        try {
            segmentAllocator.allocate(ValueLayout.JAVA_BYTE, 5);
        }catch (IllegalArgumentException ex){
            System.out.println("Expected ");
        } catch (Throwable t){
            System.out.println("actual is "+t);
        }
    }
===
output:
actual is java.lang.IndexOutOfBoundsException