elharo opened a new issue, #12603:
URL: https://github.com/apache/maven/issues/12603
# DefaultInheritanceAssembler: NPE from null artifactId
**Found in:** maven-4.0.x branch
**File:**
`impl/maven-impl/src/main/java/org/apache/maven/impl/model/DefaultInheritanceAssembler.java`
(lines 99-109)
**Severity:** Medium
## Description
`child.getArtifactId()` can return null for POMs that inherit their
artifactId. At line 128, `childName.equals(childDirectory)` would then NPE:
```java
String childName = child.getArtifactId(); // can be null
...
if (child.getProjectDirectory() != null) {
childName = child.getProjectDirectory().getFileName().toString(); //
getFileName() can return null
}
```
Additionally, `child.getProjectDirectory().getFileName()` returns null for
root paths (e.g., `/`), causing NPE at `.toString()`.
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