RFR: 8341775: Duplicate manifest files are removed by jarsigner after signing

[Weijun Wang]

On Mon, 18 Nov 2024 22:40:40 GMT, Kevin Driver <kdriver at openjdk.org> wrote:

> JDK-8341775: In the case where there is a *single* META-INF directory but potentially *multiple* manifest files of different cases, print a warning before selecting the first one and ignoring the rest (the current behavior should be maintained).
> 
> **Note**: We cannot (so far) pass whether the verbose flag is set to the class that does this processing. We may want to add a property to the builder for this. As-is, the message will be printed via `System.err` whether verbose is set or not.

Two comments:
1. The warning should only be shown by the `jarsigner` tool. `JarSigner` is an API and should not write to `System.err`.
2. There are other warnings by `jarsigner` and the new one should be a part of them, i.e. no separate header. It also should be localized.

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PR Comment: https://git.openjdk.org/jdk/pull/22222#issuecomment-2512929699