RFR: 8357862: Java argument file is parsed unexpectedly with trailing comment

[Vicente Romero]

On Mon, 2 Jun 2025 13:46:23 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review this fix to correctly parse tokens in an argument file that contains trailing comments without preceding whitespace characters before the '#' comment marker, the number sign.
> 
> The specifaction of the `java` Command has in section [java Command-Line Argument Files](https://docs.oracle.com/en/java/javase/12/docs/specs/man/java.html#java-command-line-argument-files):
> 
> Use the number sign `#` in the argument file to identify comments.
> All characters following the `#` are ignored until the end of line.
> 
> There is not requirement specified to prepend a comment in a line with at least one argument with one or more preceding whitespace characters.

the fact that not including a space between the comment and the previous element created havoc seems to indicate that the scanner is pretty fragile and could break again in the future. We should probably file a follow up to make this code more reliable

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PR Comment: https://git.openjdk.org/jdk/pull/25589#issuecomment-2931287541