RFR: 8378607: GlyphLayout cache can prevent Fonts from being GC'd

[Daniel Gredler]

On Wed, 25 Feb 2026 00:52:24 GMT, Phil Race <prr at openjdk.org> wrote:

> Update a cache in GlyphLayout.java to use a WeakHashMap
> The maximum cache size is also reduced.
> The intention is to allow Fonts loaded via Font.createFont() to be collected once the application drops references.

I'm not sure about the thread safety of `cacheRef`. Is there a reason that it's not declared final and initialized immediately in the declaration? It's inside of `SDCache`, so it wouldn't be initialized unless needed anyway (nested static class lazy init).

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PR Comment: https://git.openjdk.org/jdk/pull/29904#issuecomment-3972890895