RFR: 8318812: LauncherHelper.checkAndLoadMain closes jar file that's about to be re-opened [v3]

[Christian Stein]

On Mon, 19 Feb 2024 15:42:05 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this PR that makes the launcher helper keep a reference to the executable JAR file active after extracting the name of the main class and returning it as Class instance. Now, when loading classes from the JAR file, it hasn't to be re-opened.
>
> Christian Stein has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Improve comment
>  - Update copyright year

Re-tested Tier1-3 OK

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

PR Comment: https://git.openjdk.org/jdk/pull/17843#issuecomment-1953594654