RFR: 8265765: DomainKeyStore may stop enumerating aliases if a constituting KeyStore is empty

[Hai-May Chao]

On Tue, 8 Feb 2022 23:03:41 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> This is to fix `DomainKeyStore::engineAliases` to take into account that there may be empty keystore(s) within the collection of keystores of a domain keystore.
>
> Looks good to me.
> 
> Do you want to play with text blocks in the test for `twoPartsConfiguration` and `threePartsConfiguration`?

@wangweij Thanks for the review. The `threePartsConfiguration` with the current names for the three keystores would fail the test without the fix in engineAliases. So I'd keep the text block for it as is because names in Map entry order may differ. For the `twoPartsConfiguration`, its domainkeystore has no empty keystore inside it, so it'd cover the "non empty" part of the testing. Is there a particular configuration that you thought to be covered?

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PR: https://git.openjdk.java.net/jdk/pull/7386