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https://issues.apache.org/jira/browse/MNG-7110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294779#comment-17294779
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Robert Scholte commented on MNG-7110:
-------------------------------------
When comparing the debug output and ignoring the obvious differences there is
one that is very interesting:
{noformat:title=Maven 3.6.3}
[DEBUG] Created new class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Importing foreign packages into class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Imported: < maven.api
[DEBUG] Populating class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Included: net.oneandone.maven.poms:foss-configs:jar:1.2
[DEBUG] Included: org.codehaus.plexus:plexus-utils:jar:1.1
[DEBUG] Extension realms for project
com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:jar:1.0-SNAPSHOT:
[ClassRealm[extension>net.oneandone.maven.poms:foss-configs:1.2, parent:
sun.misc.Launcher$AppClassLoader@4e25154f]]
[DEBUG] Created new class realm
project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT
[DEBUG] Populating class realm
project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT
[DEBUG] Included: net.oneandone.maven.poms:foss-configs:jar:1.2
[DEBUG] Looking up lifecycle mappings for packaging jar from
ClassRealm[project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT,
parent: ClassRealm[maven.api, parent: null]]
[DEBUG] Extension realms for project
net.oneandone.maven.poms:foss-parent:pom:1.6.1:
[ClassRealm[extension>net.oneandone.maven.poms:foss-configs:1.2, parent:
sun.misc.Launcher$AppClassLoader@4e25154f]]
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT,
parent: ClassRealm[maven.api, parent: null]]
{noformat}
{noformat:title=Maven 4}
[DEBUG] Created new class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Importing foreign packages into class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Imported: < maven.api
[DEBUG] Populating class realm
extension>net.oneandone.maven.poms:foss-configs:1.2
[DEBUG] Included: net.oneandone.maven.poms:foss-configs:jar:1.2
[DEBUG] Extension realms for project
com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:jar:1.0-SNAPSHOT:
[ClassRealm[extension>net.oneandone.maven.poms:foss-configs:1.2, parent:
sun.misc.Launcher$AppClassLoader@4e25154f]]
[DEBUG] Created new class realm
project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT
[DEBUG] Populating class realm
project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT
[DEBUG] Included: net.oneandone.maven.poms:foss-configs:jar:1.2
[DEBUG] Looking up lifecycle mappings for packaging jar from
ClassRealm[project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT,
parent: ClassRealm[maven.api, parent: null]]
[DEBUG] Extension realms for project org.codehaus.groovy:groovy-all:pom:2.5.4:
(none)
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[plexus.core, parent: null]
[DEBUG] Extension realms for project
org.spockframework:spock-bom:pom:1.2-groovy-2.5: (none)
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[plexus.core, parent: null]
[DEBUG] Extension realms for project
net.oneandone.maven.poms:foss-parent:pom:1.6.1:
[ClassRealm[extension>net.oneandone.maven.poms:foss-configs:1.2, parent:
sun.misc.Launcher$AppClassLoader@4e25154f]]
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[project>com.github.mfriedenhagen:plugin-classpath-maven-3-and-4:1.0-SNAPSHOT,
parent: ClassRealm[maven.api, parent: null]]
[DEBUG] Extension realms for project org.codehaus.groovy:groovy-all:pom:2.5.4:
(none)
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[plexus.core, parent: null]
[DEBUG] Extension realms for project
org.spockframework:spock-bom:pom:1.2-groovy-2.5: (none)
[DEBUG] Looking up lifecycle mappings for packaging pom from
ClassRealm[plexus.core, parent: null]
{noformat}
For some reason the extension dependencies are now handled as projects, which
is clearly a bug.
Maybe [~gnodet] has an idea, I'll need to investigate this.
> Different behavior of extensions
> --------------------------------
>
> Key: MNG-7110
> URL: https://issues.apache.org/jira/browse/MNG-7110
> Project: Maven
> Issue Type: Bug
> Affects Versions: 4.0.x-candidate
> Reporter: Mirko Friedenhagen
> Assignee: Robert Scholte
> Priority: Major
> Fix For: 4.0.0, 4.0.0-alpha-1
>
>
> * In my POM I configured the net.rumati.maven.plugins:velocity-maven-plugin
> which should render a HTML file.
> * The parent of the project has a global extension in the build section.
> * The jar of the extension does include a velocity which is picked up quite
> fine by the velocity-maven-plugin from
> the classpath by 3.6.3 but when using 4.0.0 I now need to add the extension
> jar as a dependency to the plugin.
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