On Mon, 31 Aug 2026 05:42:41 GMT, Aleksey Shipilev <[email protected]> wrote:

> ... But we specifically added special types for filler objects so that they 
> do not appear as int[]. So which filler objects are appearing as int[] and 
> why?

Re fillers, there are filler-obj and filler-array. (To make things worse, both 
are collectively called filler objs...) we always use filler-array unless the 
gap is too small for an array, then we use a single filler-obj. The 
filler-array is just int-array.

However, as Thomas pointed out, heap dump can probably report them as 
filler-array instead of int-array, just like jmap.

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PR Comment: https://git.openjdk.org/jdk/pull/32542#issuecomment-5476660791

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