gnodet opened a new issue, #12085:
URL: https://github.com/apache/maven/issues/12085
## Description
When building projects that inherit their version from a remote parent POM
(with `<relativePath/>`), Maven 4 fails with `Invalid Collect Request: null`
during dependency collection. The root artifact passed to
`CollectRequest.setRootArtifact()` is null.
This affects projects where `mvnup --infer` removes the child version
because it matches the parent version. After removal, Maven 4 should inherit
the version from the remote parent, but the project artifact appears to not be
properly initialized.
## Steps to Reproduce
1. Build `apache/causeway-app-helloworld` with Maven 4 after running `mvnup
apply`
2. mvnup removes `<version>3.6.0</version>` from child POM because it
matches parent
3. The POM has:
```xml
<parent>
<groupId>org.apache.causeway.app</groupId>
<artifactId>causeway-app-starter-parent</artifactId>
<version>3.6.0</version>
<relativePath/>
</parent>
<artifactId>helloworld-jpa</artifactId>
<groupId>org.apache.causeway.starters</groupId>
<!-- version removed by mvnup inference, inherited from parent -->
```
## Error
```
[ERROR] Invalid Collect Request: null ->
[org.apache.causeway.mavendeps:causeway-mavendeps-webapp:pom:3.6.0 (compile),
...] < [central (...), staging (...)]
java.lang.IllegalArgumentException: Invalid Collect Request: null -> [...]
at
org.eclipse.aether.internal.impl.DefaultRepositorySystemValidator.mayThrow(DefaultRepositorySystemValidator.java:62)
at
org.eclipse.aether.internal.impl.DefaultRepositorySystemValidator.validateCollectRequest(DefaultRepositorySystemValidator.java:220)
at
org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:246)
at
org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:158)
```
## Affected Projects
- `causeway-app-helloworld`
- `causeway-app-petclinic`
- `causeway-app-simpleapp`
All inherit from `causeway-app-starter-parent:3.6.0` →
`spring-boot-starter-parent:3.5.13`.
## Analysis
In `DefaultProjectDependenciesResolver.resolve()` (line 98):
```java
collect.setRootArtifact(RepositoryUtils.toArtifact(project.getArtifact()));
```
`project.getArtifact()` returns null, so `RepositoryUtils.toArtifact()`
returns null (line 136-138).
The model building succeeds (dependencies have proper versions like 3.6.0
and 3.5.13), so the project model IS correctly built with inherited version.
But the project artifact is not initialized.
Notable: the child POM has a DIFFERENT `groupId` from the parent, and uses
`<relativePath/>` (empty, resolve from repo).
_Claude Code on behalf of Guillaume Nodet_
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