RFR: 8273471: Add foldmultilines to UL for stdout/err [v4]

[Yasumasa Suenaga]

On Thu, 9 Sep 2021 15:53:31 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> If you run with the following command-line:
> 
> ```
> java -Xlog:exceptions:::foldmultilines=true -Xlog:cds:::foldmultilines=false
> ```
> 
> Does it give a warning, or does it change foldmultilines of stdout to false?

I think it should give a warning and should keep first option (`foldmultilines=true`). It is same behavior with JDK 16.
In following case, `filecount` for test.log set to `1` - it is first option.


$ java  -Xlog:logging=info -Xlog:os=warning:file=test.log::filecount=1 -Xlog:exceptions=info:file=test.log::filecount=2 --version
[0.000s][warning][logging] Output options for existing outputs are ignored.

  (snip)

[0.010s][info   ][logging] Log output configuration:
[0.010s][info   ][logging]  #0: stdout all=warning,logging=info uptime,level,tags
[0.010s][info   ][logging]  #1: stderr all=off uptime,level,tags
[0.010s][info   ][logging]  #2: file=test.log all=off,os=warning,exceptions=info uptime,level,tags filecount=1,filesize=20480K


We need to improve this message of course as you said, but I want to work for it in another issue because the behavior in this PR is same with log file output.

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PR: https://git.openjdk.java.net/jdk/pull/5407