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flatten output is not reproducible #256

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hboutemy opened this issue Feb 24, 2022 · 1 comment

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hboutemy commented Feb 24, 2022

for example exclusions gavs in https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/camel/camel/camel-3.13.0.diffoscope

hboutemy mentioned this issue

investigate flatten-maven-plugin non-reproducible output jvm-repo-rebuild/reproducible-central#73

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hboutemy commented May 21, 2022

trying to analyze: issue happens only with exclusions in dependencies
flatten-plugin writes the pom with MavenXpp3Writer class that writes exclusions in a reproducible way: https://maven.apache.org/ref/3.8.5/maven-model/xref/org/apache/maven/model/io/xpp3/MavenXpp3Writer.html#L766
BUT the class itself does not do the same order before and after 3.8.1: for example in Maven 3.6.3 (that is used by rebuild.sh), order is opposite https://maven.apache.org/ref/3.6.3/maven-model/xref/org/apache/maven/model/io/xpp3/MavenXpp3Writer.html#L766

consequences:

no issue in flatten-maven-plugin
it's a question of choice of Maven version: with 3.8.2+, it writes groupId then artifactId, with 3.8.1- it writes artifactId then groupId

hboutemy closed this as completed

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