I think skipping 9 Java versions between Maven 3 and 4 is a big deal and
has never happened before 😁

Java 17 will be required for Maven 4.

Also Maven 4: extensions where you can use pom.conf or pom.yml etc.

On Mon, 23 Sept 2024, 10:53 Robert Scholte, <rfscho...@apache.org> wrote:

> Hi all,
>
>
>
> Within 2 weeks I will do a talk with Maarten about Maven 4.
>
> Part of that are some slides about previous major releases that should
> clearly explain why it was a major release at not the next minor.
>
>
>
> In short I came with this list:
>
>
>
> M1 -> M2: (breaking change, migration required)
>
>               modelVersion: 3.0.0  -> 4.0.0
>
>               xsd: https://maven.apache.org/xsd/maven-v3_0_0.xsd ->
> https://maven.apache.org/xsd/maven-4.0.0.xsd
>
>               (as doc):
>
> https://maven.apache.org/archives/maven-1.x/reference/maven-model/3.0.2/mave
> n.html
> <https://maven.apache.org/archives/maven-1.x/reference/maven-model/3.0.2/maven.html>
> -> https://maven.apache.org/ref/3.9.9/maven-model/maven.html
>
>               Spod: project.xml -> pom.xml
>
>               plugin: written in Jelly (=executable XML) -> written in Java
>
>               repository layout:
> /repository/maven/jars/maven-1.0-beta-8.jar
> -> /repository/org/apache/maven/maven-core/2.2.1/maven-core-2.2.1.jar
>
>               introduction of lifecycles
>
> M2->M3: (migration required for reporting plugins)
>
>               Extract dependency/artifact related code to separate
> independent library: Aether
>
>               Extract maven-reporting to separate independent  library:
> maven-reporting-api + maven-reporting-impl
>
>               Maven-reactor-plugin -> embedded
> (https://maven.apache.org/plugins/maven-reactor-plugin/index.html)
>
> (for the end-user most changes were invisible, as they were mainly under
> the
> hood)
>
>
>
> Did I miss something important and are these statements correct?
>
>
>
> Thanks,
>
> Robert
>
>

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