if (session != null) {
                try {
                    modelBuildingRequest.setRootDirectory(session.getRootDirectory());
                } catch (IllegalStateException e) {
                    // can happen if root directory cannot be found, just ignore
                }
            }
            */

            return modelBuildingRequest;
        }

        // workspace
        if (source == null) {
            try {
                source = container.lookup(ArtifactMetadataSource.class);
            } catch (ComponentLookupException e) {
                // won't happen
            }
        }

        if (listeners == null) {
            listeners = new ArrayList<>();

            if (logger.isDebugEnabled()) {

    }

    protected DefaultModelRepositoryHolder(DefaultModelRepositoryHolder holder) {
        this.session = holder.session;
        this.repositoryMerging = holder.repositoryMerging;
        this.pomRepositories = List.copyOf(holder.pomRepositories);
        this.externalRepositories = List.copyOf(holder.externalRepositories);
        this.repositories = List.copyOf(holder.repositories);
    }

    @Override

     *
     * @param session The session to use to resolve the model, must not be {@code null}.
     * @param parent The parent coordinates to resolve, must not be {@code null}.
     * @param modified a holder for the updated parent, must not be {@code null}.
     * @return The source of the requested POM, never {@code null}.
     * @throws ModelResolverException If the POM could not be resolved from any configured repository.
     */

                VersionRange.createFromVersion("1.0"),
                "type",
                null,
                "system",
                "compile");

        // this one should never happen in practice...
        Artifact artifact5 = factory.createDependencyArtifact(
                "test-grp", "test-artifact-5", VersionRange.createFromVersion("1.0"), "type", null, "system", "system");

              </params>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>attach-artifact</goal>
            </goals>
            <configuration>
              <artifacts>