RFR: JDK-8260694: (fc) Add apiNote to FileChannel.transferFrom to better describe "no bytes available" case

[Hamlin Li]

On Mon, 1 Feb 2021 02:26:23 GMT, Hamlin Li <mli at openjdk.org> wrote:

> We'd better put more detailed messages in FileChannel.transferFrom/transferTo that it will not return -1, as we met several cases where developers of framework/program assume that it will return -1 on some error conditions, e.g. EOF of src Channel of transferFrom.
> 
> please check more details in JDK-8260486, and discussion in https://mail.openjdk.java.net/pipermail/nio-dev/2021-January/008094.html

interesting, why it keeps failing? I just modified the javadoc in the patch. is this an environment issue?

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PR: https://git.openjdk.java.net/jdk/pull/2329