Grzegorz Grzybek created MNG-7741:
-------------------------------------

             Summary: Add more information when using 
-Dmaven.repo.local.recordReverseTree=true
                 Key: MNG-7741
                 URL: https://issues.apache.org/jira/browse/MNG-7741
             Project: Maven
          Issue Type: Improvement
            Reporter: Grzegorz Grzybek


I much appreciate adding {{-Dmaven.repo.local.recordReverseTree=true}} option 
to Maven Core (supported by new resolver features).

After initial idea, I added few more options to 
https://github.com/grgrzybek/tracking-maven-extension and I'd be happy to see 
these in {{org.apache.maven.internal.aether.ReverseTreeRepositoryListener}}.

I did some experiments locally and I have improvement ready which:

h5. tracks information about missing dependencies

when using non-existing dependency (like {{org.slf4j:slf4j-apix}}), I can see 
{{~/.m2/repository/org/slf4j/slf4j-apix/1.7.36/.tracking/grgr_simplest_jar_1.0.miss}}
 file with:
{noformat}
org.slf4j:slf4j-apix:pom:1.7.36
  org.slf4j:slf4j-apix:jar:1.7.36 (compile) (project)
    grgr:simplest:jar:1.0 (project)

Configured repositories:
 - central : https://repo.maven.apache.org/maven2
{noformat}

h5. tracks information about actual repository information (in 
{{_remote.repositories}} we have only the ID)

For example
{noformat}
org.apache.maven.plugins:maven-compiler-plugin:pom:3.10.1
  org.apache.maven.plugins:maven-compiler-plugin:3.10.1
    org.apache.maven:maven-core:3.9.1:default-lifecycle-bindings (implicit)

Repository: central (https://repo.maven.apache.org/maven2, default, releases)
{noformat}

h5. tracks information where only POM is downloaded

For example with 
{{!/.m2/repository/com/google/guava/guava-parent/16.0.1/.tracking/org.apache.maven.plugins_maven-surefire-plugin_jar_3.0.0.dep}}:
{noformat}
com.google.guava:guava-parent:pom:16.0.1
  com.google.guava:guava:jar:16.0.1 (compile) (plugin)
    org.sonatype.sisu:sisu-guice:jar:no_aop:3.2.3 (compile) (plugin)
      org.apache.maven:maven-core:jar:3.2.5 (provided) (plugin)
        org.apache.maven.shared:maven-common-artifact-filters:jar:3.1.1 
(compile) (plugin)
          org.apache.maven.surefire:maven-surefire-common:jar:3.0.0 (compile) 
(plugin)
            org.apache.maven.plugins:maven-surefire-plugin:jar:3.0.0 () (plugin)

Repository: central (https://repo.maven.apache.org/maven2, default, releases)
{noformat}

h5. tracks reverse trees originating from plugins (also implicit ones)

{noformat}
org.apache:apache:pom:26
  org.apache.maven.plugins:maven-resources-plugin:3.3.0
    org.apache.maven:maven-core:3.9.1:default-lifecycle-bindings (implicit)

Repository: central (https://repo.maven.apache.org/maven2, default, releases)
{noformat}



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