RFR: 8356308: Assert with -Xlog:class+path when classpath has an empty element [v3]

[Calvin Cheung]

On Thu, 29 May 2025 20:01:35 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> When the classpath has an element that's the empty string (e.g., `java  -Xlog:class+path -cp :abc ...`, where the first element is `""` and the second element is `"abc"`), the VM asserts.
>> 
>> The fix is simple:
>> 
>> 
>> -     if (do_substitute) {
>> +     if (do_substitute && remove_prefix_len > 0) {
>> 
>> 
>> I also improved the logs to help debugging classpath mismatches when using the AOT cache.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   @dholmes-ora comments

LGTM.

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Marked as reviewed by ccheung (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25372#pullrequestreview-2879765447