gnodet opened a new issue, #12432:
URL: https://github.com/apache/maven/issues/12432
## Summary
`gmavenplus-plugin` fails with `UnsupportedOperationException` when
executing `removeStubs` under Maven 4. This affects **even the latest version
(4.1.1)**, meaning there is no version that mvnup could upgrade to.
The plugin likely calls a method on a Maven API object that returns an
immutable list in Maven 4 (similar to scala-maven-plugin#911 which was fixed by
returning mutable copies). The `removeStubs` goal tries to mutate a list
returned by the Maven API.
## Affected projects (from Maven 4 compatibility testing)
- **jackrabbit-oak** — `gmavenplus-plugin:3.0.2:removeStubs` →
`UnsupportedOperationException`
- **tinkerpop** — `gmavenplus-plugin:4.1.1:removeStubs` →
`UnsupportedOperationException` (latest version!)
## Error output
```
[ERROR] Failed to execute goal
org.codehaus.gmavenplus:gmavenplus-plugin:4.1.1:removeStubs (default)
on project gremlin-groovy: Execution default of goal
org.codehaus.gmavenplus:gmavenplus-plugin:4.1.1:removeStubs failed.
UnsupportedOperationException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
goal
org.codehaus.gmavenplus:gmavenplus-plugin:4.1.1:removeStubs (default) [...]
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
default [...]
Caused by: java.lang.UnsupportedOperationException
```
## Analysis
This is the same class of issue as `scala-maven-plugin < 4.9.5` (already in
`known-issues.json`): Maven 4 returns immutable collections from API methods
that returned mutable lists in Maven 3. The scala-maven-plugin fixed this in
4.9.5 by copying the list before modifying it.
For gmavenplus-plugin, the fix needs to be done upstream
(https://github.com/groovy/GMavenPlus). Since even version 4.1.1 (latest) is
broken, this should be:
1. Reported upstream to GMavenPlus
2. Added to `known-issues.json` in the testing framework
3. Once fixed upstream, added to mvnup's `PLUGIN_UPGRADES` list
## Relevant upstream
- GMavenPlus repo: https://github.com/groovy/GMavenPlus
- Similar fix in scala-maven-plugin:
https://github.com/davidB/scala-maven-plugin/commit/e6d922eb
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