On Mon, 14 Jul 2025 19:38:04 GMT, Naoto Sato <na...@openjdk.org> wrote:

>> src/java.base/share/classes/java/io/Console.java line 49:
>> 
>>> 47:  * was launched.  If the virtual machine is started automatically, for
>>> 48:  * example by a background job scheduler, or if one or both of the
>>> 49:  * standard input or output has been redirected, then it may not have a
>> 
>> If we are claiming that `System.console()` should **only** return a "Console 
>> instance only when both standard input and output are connected to a 
>> terminal." then is the _may_ wording not restrictive enough? Or is that 
>> nuance negligible?
>
> Intention here is that, we do want to restirct to not return JLine based 
> Console when either/both of stdin/out is redirected, I think we would not 
> want to restrict them as the spec. For example, `System.console()` in jshell 
> returns non-null, even if the remote JVM is not-attached to a terminal. I 
> will describe this sublety in the CSR

OK, I see your point. It is a hint as to what the behavior of this 
implementation does, but not enforced in the specification by any means as 
indicated by the _may_ wording. Nit: if that is the case, then shouldn't there 
technically be minimal compatibility risk in the CSR, since nothing is being 
"enforced" specification wise.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26299#discussion_r2205797490

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