[maven-4.0.x] DefaultInheritanceAssembler: NPE from null artifactId

[elharo]

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:

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().