Hi folks,
This may be of general interest, at least I had no idea about the consequences.
So I thought I’d share the result of my research.
> Am 06.01.2022 um 10:30 schrieb Thomas Vandahl <t...@apache.org>:
>
>> Maybe somebody else knows how that can happen.
> The effective POM shows the following entry:
> <project.build.outputTimestamp>2020-01-22T15:10:15Z</project.build.outputTimestamp>
>
> Now we see why the year number in NOTICE is wrong. But who sets this?
Found it. For the information of all interested parties, the following command
mvn org.apache.maven.plugins:maven-help-plugin:3.2.0:effective-pom
-Dverbose=true
produces the line (among others)
<project.build.outputTimestamp>2020-01-22T15:10:15Z</project.build.outputTimestamp>
<!-- org.apache:apache:23, line 95 —>
which actually is true. See
https://search.maven.org/artifact/org.apache/apache/23/pom
This entry causes different things to happen to the build artifacts, for
example a fixed last-modified-date for all Jar entries:
—8<—
...
7743 Wed Jan 22 15:10:16 CET 2020
META-INF/maven/org.apache.commons/commons-jcs3-core/pom.xml
68 Wed Jan 22 15:10:16 CET 2020
META-INF/maven/org.apache.commons/commons-jcs3-core/pom.properties
...
—8<—
Or the Javadoc files, respectively:
—8<—
...
10046 Wed Jan 22 15:10:16 CET 2020 overview-frame.html
17979 Wed Jan 22 15:10:16 CET 2020 overview-summary.html
131038 Wed Jan 22 15:10:16 CET 2020 overview-tree.html
...
—8<—
So unless you explicitly set the property project.build.outputTimestamp on your
own, all your artifacts will derive it from the Apache Parent POM.
Recent example:
—8<—
...
15417 Wed Jan 22 15:10:16 CET 2020
META-INF/maven/commons-cli/commons-cli/pom.xml
57 Wed Jan 22 15:10:16 CET 2020
META-INF/maven/commons-cli/commons-cli/pom.properties
...
—8<—
Obviously, this has to do with
https://maven.apache.org/guides/mini/guide-reproducible-builds.html
There it is mentioned that the maven-release-plugin 3.0.0-M1 and later is
supposed update the property (which it doesn’t as we see).
Bye, Thomas
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