elharo opened a new issue, #248:
URL: https://github.com/apache/maven-artifact-plugin/issues/248
`CompareMojo.getRepositoryFilename(Artifact)` (lines 328-331):
```java
String path =
session.getRepositorySession().getLocalRepositoryManager().getPathForLocalArtifact(a);
return path.substring(path.lastIndexOf('/'));
```
`path.substring(path.lastIndexOf('/'))` throws
`StringIndexOutOfBoundsException` if the local-repo layout returns a filename
without a `/` separator (root-based `pom` layout in some configurations). Also
a negative index propagates as a confusing runtime exception rather than a
clean `MojoExecutionException`.
Suggested fix: guard `lastIndexOf('/')` and use `Path`-based extraction.
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