RFR: 8311030: ResourceBundle.handleKeySet() is racy

[Sergey Tsypanov]

On Wed, 28 Jun 2023 11:05:11 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

> Double-checked locking should rely on local variable to avoid racy reads from volatile field.

It'd be a benign race in case all members of `HashSet` are `final`, but they aren't, so there are no safe publication guarantees.

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PR Comment: https://git.openjdk.org/jdk/pull/14692#issuecomment-1611915175