*             {@link JavaToolchainImpl} instead.
 */
@Deprecated
public class DefaultJavaToolChain extends JavaToolchainImpl {
    public static final String KEY_JAVAHOME = JavaToolchainImpl.KEY_JAVAHOME;

    public DefaultJavaToolChain(ToolchainModel model, Logger logger) {
        super(model, logger);
    }

    @Override
    public String getJavaHome() {

 * into itself leading to a stack overflow.
 *
 * A side effect of using @Typed is that it translates to explicit bindings in the container.
 * So instead of binding the component under a 'wildcard' key it is now bound with an explicit
 * key. Since this is a default component this will be a plain binding of ModelProcessor to
 * this implementation type, ie. no hint/name.
 *

        if (version != null) {
            for (String key : Arrays.asList("changelist", "revision", "sha1")) {
                String val = context.getUserProperty(key);
                if (val != null) {
                    version = version.replace("${" + key + "}", val);
                }
            }
        }
        return version;
    }

      ]]></configuration>
      <description>The ArtifactRepository instance referencing the local artifact
        repository.</description>
      <cliOptions>
        <cliOption>
          <key>-Dmaven.repo.local=/path/to/local/repo</key>
          <value>Override the local repository location on a per-build basis.</value>
        </cliOption>
      </cliOptions>
    </expression>
    <expression>
      <syntax>reactorProjects</syntax>

    }

    @Override
    public void setProperty(Project project, String key, String value) {
        Properties properties = getMavenProject(project).getProperties();
        if (value == null) {
            properties.remove(key);
        } else {
            properties.setProperty(key, value);
        }
    }

    @Override
    public Map<String, String> getProperties(Project project) {

 *
 * Implementation must have {@code equals()} and {@code hashCode()} implemented, so implementations of this interface
 * can be used as keys.
 *
 * @since 4.0.0
 */
@Experimental
public interface ExtensibleEnum {

    /**
     * The {@code id} uniquely represents a value for this extensible enum.

    }

    @Override
    public Path getPath() {
        return artifact.getPath();
    }

    @Override
    public String getProperty(String key, String defaultValue) {
        return artifact.getProperty(key, defaultValue);
    }

    @Override
    public Map<String, String> getProperties() {
        return artifact.getProperties();
    }

    public String getMessage() {

                .filter(m -> version == null || version.equals(getVersion(m)))
                .reduce((a, b) -> {
                    throw new IllegalStateException(
                            "Multiple modules with key " + a.getGroupId() + ':' + a.getArtifactId());
                })
                .orElse(null);
    }

    private String getVersion(Model model) {
        String version = model.getVersion();

@REM   MAVEN_ARGS        (Optional) Arguments passed to Maven before CLI arguments.
@REM   MAVEN_BATCH_ECHO  (Optional) Set to 'on' to enable the echoing of the batch commands.
@REM   MAVEN_BATCH_PAUSE (Optional) set to 'on' to wait for a key stroke before ending.
@REM   MAVEN_OPTS        (Optional) Java runtime options used when Maven is executed.
@REM   MAVEN_SKIP_RC     (Optional) Flag to disable loading of mavenrc files.

     * Returns the project managed dependencies (directly specified or inherited).
     */
    @Nonnull
    List<DependencyCoordinate> getManagedDependencies();

    /**
     * Returns the project ID, usable as key.
     */
    @Nonnull
    default String getId() {
        return getModel().getId();
    }

    /**
     * Returns a boolean indicating if the project is the top level project for