getLogger()
                    .info(metadata + " could not be found on repository: " + remoteRepository.getId()
                            + ", so will be created");

            // delete the local copy so the old details aren't used.
            if (file.exists()) {
                if (!file.delete()) {
                    // sleep for 10ms just in case this is windows holding a file lock

We are looking at using Mercury for the resolution and retrieval of the plugin dependencies so during development we would translate the POMs into dependency information that Mercury can understand, and in production we would have the pre-digested format that Mercury could utilize to resolve and retrieve dependencies. We need to be careful that we are using Mercury during development and production so that we don’t get in the situation where Maven 2.x is resolving differently than Mercury is. We...

need it so that empty directory does not get deleted...

 -----
 Jason van Zyl
 Vincent Siveton
 Hervé Boutemy
 -----
 2011-06-12
 -----

Maven 4 API - Immutable Maven Model

 This is strictly the immutable model for Maven POM (Project Object Model), so really just plain objects in <<<org.apache.maven.api.model>>> package.

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with <<<Builder>>> inner classes for immutable instances creation.

 * but can be extended by registering a {@code org.apache.maven.api.spi.LanguageProvider}.
 * <p>
 * Implementation must have {@code equals()} and {@code hashCode()} implemented, so implementations of this interface
 * can be used as keys.
 *
 * @since 4.0.0
 */
@Experimental
@Immutable
@SuppressWarnings("checkstyle:InterfaceIsType")
public interface Language extends ExtensibleEnum {

     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {

        // We are doing something like "mvn resources:resources" where no version is specified but this
        // project we are working on has the version specified in the POM so the version should come from there.
        File pom = getProject("project-basic");
        MavenSession session = createMavenSession(pom);
        assertEquals("project-basic", session.getCurrentProject().getArtifactId());

        /*
         * NOTE: Metadata at the g:a level contains a collection of available versions. After merging, we can't tell
         * which repository provides which version so the metadata manager must not restrict the artifact resolution to
         * the repository with the most recent updates.
         */
    }

        // I'm fully aware that the file could just be moved using File.rename but
        // there are bugs in various JVM that have problems doing this across
        // different filesystem. So we'll incur the small hit to actually copy
        // here and be safe. jvz.
        // ----------------------------------------------------------------------------

        try {

     * instance construction.
     *
     * @param session the Maven session
     * @throws MavenExecutionException in case of issue
     */
    // TODO This is too early for build extensions, so maybe just remove it?
    public void afterSessionStart(MavenSession session) throws MavenExecutionException {
        // do nothing
    }

    /**
     * Invoked after all projects were built.
     *