*
     * @param project {@link Project} or {@code null}.
     * @return the effective properties, never {@code null}
     */
    @Nonnull
    Map<String, String> getEffectiveProperties(@Nullable Project project);

    /**
     * Returns the current maven version
     * @return the maven version, never {@code null}
     */
    @Nonnull
    Version getMavenVersion();

    int getDegreeOfConcurrency();

         * DefaultRepositoryLayout does not correctly describe the layout of a local repository which unlike a remote
         * repository never uses timestamps in the filename of a snapshot artifact. The discrepancy gets notable when a
         * remotely resolved snapshot artifact gets passed into pathOf(). So producing a proper local artifact path

     * configured directly by the user on his discretion, e.g. via the {@code -Dkey=value} parameter on the command
     * line.
     *
     * @return The user properties, never {@code null}.
     */
    public Properties getUserProperties() {
        return request.getUserProperties();
    }

    /**

                    .build();
            Repository centralWithNoUpdate = central.withReleases(
                    RepositoryPolicy.newBuilder().updatePolicy("never").build());
            effective = Settings.newBuilder(effective)
                    .repositories(List.of(central))
                    .pluginRepositories(List.of(centralWithNoUpdate))
                    .build();

    }

    /**
     * Get all profiles that are detected in the projects, any parent of the projects, or the settings.
     * @param session The Maven session
     * @return A {@link Set} of profile identifiers, never {@code null}.
     */
    private Set<String> getAllProfiles(MavenSession session) {
        final Map<String, Model> superPomModels = new HashMap<>();

 * the paths specified in a {@code --patch-module} Java option is effective only for a specified module.
 * This type is created by calls to {@link #patchModule(String)} and a new instance must be created for
 * every module to patch.</p>
 *
 * <p>Path types are often exclusive. For example, a dependency should not be both on the Java class-path
 * and on the Java module-path.</p>
 *

              <!-- was only a workaround for Plexus Container, hopefully never used by anyone else -->
              <exclude>org.apache.maven.plugin.DefaultBuildPluginManager#setMojoExecutionListeners(java.util.List)</exclude>
              <!-- could have never been used due to usage of non-export class (CoreExportsProvider) -->

                    if ( updateSnapshotVersions )
                    {
                        java.util.Map<String, SnapshotVersion> versions = new java.util.LinkedHashMap<>();
                        // never convert from legacy to new format if either source or target is legacy format
                        if ( !v.getSnapshotVersions().isEmpty() )
                        {

                addToClasspath = false;
            }
            /*
             * If the test output directory provides some modules of its own, add them.
             * Except for this unusual case, tests should never be added to the module-path.
             */
            for (Map.Entry<Path, String> entry : testModules.getModuleNames().entrySet()) {
                if (!outputModules.containsModule(entry.getValue())) {

        sessionBuilder.setChecksumPolicy(request.getGlobalChecksumPolicy());
        sessionBuilder.setUpdatePolicy(
                request.isNoSnapshotUpdates()
                        ? RepositoryPolicy.UPDATE_POLICY_NEVER
                        : request.isUpdateSnapshots() ? RepositoryPolicy.UPDATE_POLICY_ALWAYS : null);

        int errorPolicy = 0;
        errorPolicy |= request.isCacheNotFound()