Remove useless Maven prerequisites section

[johanhammar]

Use maven-enforcer-plugin to enforce Maven version instead of prerequisites which generates a warning like this
[WARNING] The project io.spring.javaformat:spring-javaformat-build:pom:0.0.7-SNAPSHOT uses prerequisites which is only intended for maven-plugin projects but not for non maven-plugin projects. For such purposes you should use the maven-enforcer-plugin. See https://maven.apache.org/enforcer/enforcer-rules/requireMavenVersion.html

[snicoll]

Thanks for the PR. I am not sure that we want to enforce it that way really. The way I see it is just a way to add some metadata about the minimum Maven version we expect.

Since this project uses the maven wrapper, I'd be tempted to simply remove the prerequisite.

Let's see what the rest of the team thinks.

[wilkinsona]

I'm in favour of removing the prerequisites. If the documentation is accurate, it won't be checked unless someone tries to use Maven 2 so it seems to be largely pointless:

The only element that exists as a prerequisite in POM 4.0 is the maven element, which takes a minimum version number. It is checked with Maven 2, it is not any more in Maven 3.

The recommendation is that, when using Maven 3, the enforcer plugin is used instead. That said, I'm not sure that we should as the wrapper already provides a version of Maven. If we enforced the version anywhere, it should probably be done in Boot's spring-boot-starter-parent as that will avoid any problems with Boot's required version and Initializr's enforced version getting out of sync.

[snicoll]

Thanks for confirming. Let's remove the prerequisites.

[wilkinsona]

Oops. My comment only makes partial sense. Apparently, I thought this was an Initializr issue. Sorry for the confusion.

[snicoll]

Closed by 8074fdd

[snicoll]

@johanhammar thank you very much for your first contribution to this project. This is merged in master.