RFR: 8284313: Improve warning messages when CDS archive fails to load [v3]

[David Holmes]

On Fri, 12 Aug 2022 06:21:21 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Please review this change for adding more helpful messages when a CDS archive has failed to load without CDS logging being enabled.
>> 
>> e.g. warning for mismatch class paths between dump time and run time:
>> `[warning][cds] shared class paths mismatch (hint: enable -Xlog:class+path=info to diagnose the failure)`
>> 
>> warning if a timestamp of a jar file has been changed during run time:
>> `[warning][cds] app.jar timestamp has changed.`
>> 
>> Passed mach5 tiers 1,2,3 testing.
>
> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   more comments from David

Updates look good - thanks. One typo.

test/hotspot/jtreg/runtime/cds/appcds/WrongClasspath.java line 57:

> 55: 
> 56:     // Run with -Xshare:auto and without CDS logging enabled, the mismatch message
> 57:     // should stil be there.

typo: stil

-------------

Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9823