gnodet opened a new issue, #12353:
URL: https://github.com/apache/maven/issues/12353
## Description
`jaxb2-maven-plugin:3.1.0` (and likely 4.x) fails under Maven 4 with a
`ClassNotFoundException` for
`org.glassfish.jaxb.core.v2.model.core.package-info`. The JAXB runtime's
`package-info` classes are not visible in the plugin's classrealm.
## Error
```
[ERROR] Failed to execute goal
org.codehaus.mojo:jaxb2-maven-plugin:3.1.0:schemagen (schemagen) on project
optaplanner-core-impl:
Unable to load the mojo 'schemagen' in the plugin
'org.codehaus.mojo:jaxb2-maven-plugin:3.1.0'.
A required class is missing:
org.glassfish.jaxb.core.v2.model.core.package-info
-----------------------------------------------------
realm = plugin>org.codehaus.mojo:jaxb2-maven-plugin:3.1.0
strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
urls[0] = file:...jaxb2-maven-plugin-3.1.0.jar
urls[1] = file:...jaxb-xjc-3.0.0.jar
urls[2] = file:...jaxb-jxc-3.0.0.jar
...
Number of foreign imports: 1
import: Entry[import from realm ClassRealm[maven.api, parent: null]]
```
## Root cause
Maven 4's classrealm construction for plugins filters or doesn't expose
`package-info` classes from transitive dependencies. The `jaxb-core` jar is
either not included in the plugin classrealm or its `package-info` classes are
not accessible due to the module/package filtering in `maven.api`.
The same build succeeds with Maven 3, where the plugin classrealm
construction is more permissive.
## Reproducer
```bash
git clone https://github.com/apache/incubator-kie-optaplanner.git
cd incubator-kie-optaplanner
mvn -B -e clean package -DskipTests
```
The `schemagen` goal on `optaplanner-core-impl` fails.
## Context
Found during [Maven 4 compatibility
testing](https://github.com/gnodet/maven4-testing/issues/13307) of Apache
projects.
_Claude Code on behalf of Guillaume Nodet_
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