renechoi opened a new pull request, #13099:
URL: https://github.com/apache/maven/pull/13099
On a recursive reference `DefaultModelInterpolator` records an ERROR and
returns `null`. The transformer writes it into `List<String>` fields such as
`build/filters` (its `Properties` branch already guards), and the immutable
constructor calls `List.copyOf`, so the build dies with a bare NPE that hides
the collected error:
```
java.lang.NullPointerException
at java.util.List.copyOf(List.java:1193)
at o.a.m.model.v4.MavenTransformer.transformBuild(:514)
at o.a.m.impl.model.DefaultModelInterpolator.interpolateModel(:111)
```
Returning the original text fixes it at the source instead of in the
generated template, and matches `DecryptingSettingsTransformer` and MNG-8174
(#12932), which covered Maven 3 only.
The new test fails on master with that NPE. Full `mvn test`: 3136 tests, 0
failures. Can open a `maven-4.0.x` backport.
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