RFR: 6924219: (fc spec) FileChannel.write(ByteBuffer, position) behavior when file opened for append not specified

[Alan Bateman]

On Thu, 13 Oct 2022 23:47:54 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Add some verbiage stating that the outcome of invoking the absolute write method `java.nio.channels.write(ByteBuffer,long)` is unspecified when the channel was opened with the `APPEND` option present.

If something has a file opened for append then it's a bug to attempt to write and specify a position. It would be possible to detect this, throw an exception, and thus avoid bugs. However it would be a behavior change. The conservative approach is to specify that it leads to unspecified behavior as you have done.

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PR: https://git.openjdk.org/jdk/pull/10707