elharo opened a new pull request, #12935:
URL: https://github.com/apache/maven/pull/12935
Backport of #12932 (merge commit `8638f335`) to `maven-4.0.x`, fixing
MNG-8174.
A self-referencing property used in a plugin configuration attribute caused
an NPE during interpolation because `interpolate()` could return `null` while
recursing, and the guard `if (org != val)` would still call
`setValue`/`setAttribute` with `null`.
This backport:
- Adds `&& val != null` to both `visit(Xpp3Dom)` setters in
`StringVisitorModelInterpolator`.
- Adds regression test `testRecursiveExpressionCycleInPluginConfiguration`
asserting 1 model error and that the config attribute retains `${prop}`.
Tested: full `StringVisitorModelInterpolatorTest` (19 tests) +
`StringSearchModelInterpolatorTest` pass.
Closes https://issues.apache.org/jira/browse/MNG-8174
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