elharo opened a new issue, #1647:
URL: https://github.com/apache/maven-dependency-plugin/issues/1647
`PropertiesMojo.execute()` at line 114-118:
```java
for (Artifact artifact : artifacts) {
project.getProperties()
.setProperty(
artifact.getDependencyConflictId(),
artifact.getFile().getAbsolutePath()); // NPE if null
}
```
`project.getArtifacts()` can include artifacts where `getFile()` returns
`null` (e.g., unresolved optional dependencies, artifacts with resolution
failures that don't fully fail the build). Calling `.getAbsolutePath()` on null
throws NPE and fails the build.
The extra artifact resolution at lines 129-136 has a similar issue:
```java
artifact = resolverUtil.resolveArtifact(artifact,
project.getRemoteProjectRepositories());
this.project.getProperties().setProperty(toConflictId(artifact),
artifact.getFile().getAbsolutePath());
```
If resolution succeeds but returns a null file, this also NPEs.
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