RFR: 8354724: Methods in java.io.Reader to read all characters and all lines [v19]

[Markus KARG]

On Thu, 15 May 2025 22:07:05 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> It is **impossible** to "invest some lines" to solve this in JAX-RS, and JAX-RS as a standard technology on tens of thousands of servers. Enforcing `String` prevents these useful optimizations, but brings *no actual benefit*, as *only few* callers actually care for *constant* objects, but would be satisfied with `CharSequence`'s lack of mutation methods.
>
>> Also, in JAX-RS for example, you cannot make use of `transferTo` as what you get is a heap object, and what you must forward also is a heap object.
> 
> What relation does such a "heap object" have to character streams?

With "heap object" I meant something that is kept on the Java heap, like a `CharSequence` or `String`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24728#discussion_r2093313964