Prepare for Maven 4

[mthmulders]

While doing some contributions to eclipse-ee4j/krazo, I found that the project doesn't build on Maven 4. This is because its parent, maintained in this repo, declares a few repositories with an URL that is an expression. This is no longer supported in Maven 4:

Apache Maven 4.0.0-alpha-4-SNAPSHOT (fbdf109b34947c5cc64b8d584d0c3010351e613b)
Maven home: /opt/homebrew/Cellar/maven-snapshot/4.0.0-alpha-4-20221231.163631-23/libexec
Java version: 11.0.17, vendor: Eclipse Adoptium, runtime: /Library/Java/JavaVirtualMachines/temurin-11.jdk/Contents/Home
Default locale: en_NL, platform encoding: UTF-8
OS name: "mac os x", version: "13.1", arch: "aarch64", family: "mac"
[INFO] Scanning for projects...
[ERROR] Some problems were encountered while processing the POMs
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project org.eclipse.krazo:krazo-parent:3.1.0-SNAPSHOT (/Users/maarten/Code/open-source/krazo/pom.xml) has 4 errors
[ERROR]     'profiles.profile[snapshots].repositories.repository.[sonatype-nexus-snapshots].url' contains an expression but should be a constant. @ org.eclipse.ee4j:project:1.0.6, /Users/maarten/.m2/repository/org/eclipse/ee4j/project/1.0.6/project-1.0.6.pom, line 252, column 26
[ERROR]     'profiles.profile[snapshots].pluginRepositories.pluginRepository.[sonatype-nexus-snapshots].url' contains an expression but should be a constant. @ org.eclipse.ee4j:project:1.0.6, /Users/maarten/.m2/repository/org/eclipse/ee4j/project/1.0.6/project-1.0.6.pom, line 265, column 26
[ERROR]     'profiles.profile[staging].repositories.repository.[sonatype-nexus-staging].url' contains an expression but should be a constant. @ org.eclipse.ee4j:project:1.0.6, /Users/maarten/.m2/repository/org/eclipse/ee4j/project/1.0.6/project-1.0.6.pom, line 289, column 26
[ERROR]     'profiles.profile[staging].pluginRepositories.pluginRepository.[sonatype-nexus-staging].url' contains an expression but should be a constant. @ org.eclipse.ee4j:project:1.0.6, /Users/maarten/.m2/repository/org/eclipse/ee4j/project/1.0.6/project-1.0.6.pom, line 302, column 26
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the '-e' switch
[ERROR] Re-run Maven using the '-X' switch to enable verbose output
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

Also, the project doesn't declare which version of the Maven Install Plugin it uses - thus making it dependent on the Maven version that the user has. In Maven 4, this will trigger a warning:

[WARNING] Version not locked for default bindings plugins [maven-install-plugin], you should define versions in pluginManagement section of your pom.xml or parent

If desired, I can contribute a PR that resolves these issues.

[arjantijms]

Such PR would be most welcome I think, and thanks for starting to test EE4J projects with Maven 4 :)

[lprimak]

I think this can be closed. Maven 4 fully supports expressions now (provided they are defined before used)