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

[David Holmes]

On Wed, 21 May 2025 21:28:16 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.

This sounds like a bug in `-cp` parsing to me!

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PR Comment: https://git.openjdk.org/jdk/pull/25372#issuecomment-2900591815