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https://issues.apache.org/jira/browse/MJAR-275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17743645#comment-17743645
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Herve Boutemy commented on MJAR-275:
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timestamp is now fixed in JDK 18 and workaround coded in Maven for earlier JDKs
for patch JDK version in module-info.class, I confirm it's not stored only if
compiling to an earlier release: see
https://github.com/jvm-repo-rebuild/module-info for a clear test
does anybody have a fix? or should we open a JDK issue?
> outputTimestamp not applied to module-info; breaks reproducible builds
> ----------------------------------------------------------------------
>
> Key: MJAR-275
> URL: https://issues.apache.org/jira/browse/MJAR-275
> Project: Maven JAR Plugin
> Issue Type: Bug
> Affects Versions: 3.2.0
> Environment: Mac OS X 10.14.6
> JDK 15 (build 15+36)
> JDK 11 (build 11.0.8+10)
> Reporter: Anand Beh
> Assignee: Slawomir Jaranowski
> Priority: Minor
> Fix For: 3.3.0
>
> Attachments: MCOMPILER-439.zip, Screenshot 2020-10-25 at 2.35.59
> PM.png
>
>
> Setting {{project.build.outputTimestamp}} to a fixed value allows creating
> reproducible builds per this guide:
> [https://maven.apache.org/guides/mini/guide-reproducible-builds.html
> |https://maven.apache.org/guides/mini/guide-reproducible-builds.html]However,
> if one adds a module-info file to the project, reproducible builds break.
> This is caused by module-info.class using the latest timestamp and not
> {{project.build.outputTimestamp}}. I was able to identify the problem using
> diffoscope: [https://diffoscope.org/.|https://diffoscope.org/] With it I
> determined the timestamp across 2 builds was constant for all but the
> module-info.class:
>
> {code:java}
> -rw---- 2.0 fat 862 bl defN 20-Oct-17 00:40
> space/arim/libertybans/api/select/SelectionOrder.class
> │ -rw---- 2.0 fat 1113 bl defN 20-Oct-17 00:40
> space/arim/libertybans/api/select/SelectionOrderBuilder.class
> │ -rw---- 2.0 fat 2285 bl defN 20-Oct-17 00:40
> META-INF/maven/space.arim.libertybans/bans-api/pom.xml
> │ -rw---- 2.0 fat 74 bl defN 20-Oct-17 00:40
> META-INF/maven/space.arim.libertybans/bans-api/pom.properties
> │ --rw---- 2.0 fat 557 bl defN 20-Oct-25 12:39 module-info.class
> │ +-rw---- 2.0 fat 557 bl defN 20-Oct-25 12:41 module-info.class
> {code}
>
> Note the + and - which are diffoscope's way of indicating the difference
> between the .jar files. Here the {{project.build.outputTimestamp}} is on 17
> October. As shown, module-info has a "rebellious" timestamp.
>
> *EDIT:*
> Example project to reproduce the bug:
> [https://github.com/A248/MJAR-275|https://github.com/A248/MCOMPILER-439]
> (Renamed from [https://github.com/A248/MCOMPILER-439])
> Source code is also provided as an attachment below
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