RFR: 8264208: Console charset API [v4]

[Naoto Sato]

On Tue, 13 Apr 2021 19:30:53 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Although the code path is different, the logic to determine the encoding is not changed, as `sun.stdout/err.encoding` are only set if the VM is invoked from a terminal (in fact, there's a bug where they aren't set even in a terminal on unix env, which I fixed in this patch) which is the same condition in which `System.console()` returns the console. And for both cases, it will default to `Charset.defaultCharset()` if they are not available.
>> 
>> Having said that, one regression test started to fail with this implementation change as follows:
>> 
>> Exception in thread "main" java.util.ServiceConfigurationError: Locale provider adapter "CLDR"cannot be instantiated.
>> 	at java.base/sun.util.locale.provider.LocaleProviderAdapter.forType(LocaleProviderAdapter.java:199)
>> 	at java.base/sun.util.locale.provider.LocaleProviderAdapter.findAdapter(LocaleProviderAdapter.java:287)
>> 	at java.base/sun.util.locale.provider.LocaleProviderAdapter.getAdapter(LocaleProviderAdapter.java:258)
>> 	at java.base/java.text.NumberFormat.getInstance(NumberFormat.java:960)
>> 	at java.base/java.text.NumberFormat.getNumberInstance(NumberFormat.java:518)
>> 	at java.base/java.util.Scanner.useLocale(Scanner.java:1270)
>> 	at java.base/java.util.Scanner.<init>(Scanner.java:543)
>> 	at java.base/java.util.Scanner.<init>(Scanner.java:554)
>> 	at TestConsole.main(TestConsole.java:54)
>> Caused by: java.lang.reflect.InvocationTargetException
>> 	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>> 	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78)
>> 	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>> 	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
>> 	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
>> 	at java.base/sun.util.locale.provider.LocaleProviderAdapter.forType(LocaleProviderAdapter.java:188)
>> 	... 8 more
>> 
>> I haven't looked at it in detail but it seems that calling `System.console()` in `System.initPhase1()` is not allowed, as the module system is not there yet. So I reverted the implementation to the original and simply retained the description in `System.out/err` with a change to `determined by` to `equivalent to`.
>
> Thanks for the explanation and updates. It's a worthwhile exercise to attempt to align things around the new method. A short note above line 2023 to record this might be useful as well (sth. like it's eq to console != null ? console.charset() : Charset.defaultCharset();). No need to create another update if you decide to add the note.

Thanks. Added some explanations as suggested.

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PR: https://git.openjdk.java.net/jdk/pull/3419