gnodet opened a new issue, #12989:
URL: https://github.com/apache/maven/issues/12989
## Problem
`mvnup`'s `PluginUpgradeStrategy` upgrades `maven-checkstyle-plugin` to
3.6.0, which transitively pulls Checkstyle 10.x. Checkstyle 10.x requires JDK
21 (class file version 65.0), but these projects build with JDK 17. The build
fails:
```
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-checkstyle-plugin:3.6.0:check
on project api-parent: ...
UnsupportedClassVersionError:
com/puppycrawl/tools/checkstyle/api/CheckstyleException
has been compiled by a more recent version of the Java Runtime (class file
version 65.0),
this version of the Java Runtime only recognizes class file versions up to
61.0
```
Note: The maven4-testing workflow passes `-Dcheckstyle.skip=true`, but the
check still executes for these projects — possibly because the project binds
`checkstyle:check` to the `validate` phase with a custom execution ID that
doesn't honor the skip property, or because the older plugin version handles
the property differently.
## Affected projects (2)
- `directory-ldap-api` — runs on JDK 17, checkstyle-plugin upgraded to 3.6.0
- `directory-server` — same
## Expected behavior
`mvnup` should check whether the upgraded plugin version (or its transitive
dependencies) requires a higher JDK than the project's detected JDK. If so, it
should either:
1. Skip the upgrade
2. Pin a compatible version (e.g., checkstyle-plugin 3.4.0 for JDK 17
projects)
3. Or at minimum, add a corresponding `<checkstyle.version>` property to pin
a compatible Checkstyle version
This is the same class of issue as the jar-plugin upgrade (#12984) — mvnup
upgrades to latest but doesn't check JDK compatibility.
## Context
Data from [maven4-testing](https://github.com/gnodet/maven4-testing) run
#13307 testing `maven-4.0.x` against all Apache projects.
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