<role-hint>default</role-hint>
          <field-name>container</field-name>
        </requirement>
        <requirement>
          <role>org.apache.maven.plugin.LegacySupport</role>
          <role-hint>default</role-hint>
          <field-name>legacySupport</field-name>
        </requirement>
        <requirement>
          <role>org.eclipse.aether.RepositorySystem</role>
          <role-hint>default</role-hint>

      <role-hint>b2</role-hint>
      <implementation>org.apache.maven.artifact.manager.WagonB</implementation>
    </component>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>c</role-hint>
      <implementation>org.apache.maven.artifact.manager.WagonC</implementation>
    </component>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>string</role-hint>

 * thrown or a simple string message. In addition, a problem carries a hint about its source.
 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface BuilderProblem {

    /**
     * Gets the hint about the source of the problem. While the syntax of this hint is unspecified and depends on the
     * creator of the problem, the general expectation is that the hint provides sufficient information to the user to

     * creator of the problem, the general expectation is that the hint provides sufficient information to the user to
     * track the problem back to its origin. A concrete example for such a source hint can be the file path or URL from
     * which the settings were read.
     *
     * @return The hint about the source of the problem or an empty string if unknown, never {@code null}.
     */
    String getSource();

specific language governing permissions and limitations
under the License.
-->

<plexus>
  <components>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>testfile</role-hint>
      <implementation>org.apache.maven.artifact.resolver.TestFileWagon</implementation>
      <instantiation-strategy>per-lookup</instantiation-strategy>
    </component>
  </components>

package org.apache.maven.api.services;

/**
 * Describes a problem that was encountered during model building. A problem can either be an exception that was thrown
 * or a simple string message. In addition, a problem carries a hint about its source, e.g. the POM file that exhibits
 * the problem.
 *
 */
public interface ModelProblem extends BuilderProblem {

    /**
     * Version
     */
    enum Version {

/**
 * This realizes the metadata source via the default hint to provide backward-compat with Maven 2.x whose Plexus version
 * registered component descriptors twice: once keyed by role+roleHint and once keyed by role only. This effectively
 * made the metadata source available with its original role hint ("maven") as well as the default hint.
 *
 */
@Named
@Singleton
@Deprecated

 * the fact that the problem reporter has/should not have information about the calling context and hence cannot provide
 * an expressive source hint for the model problem. Instead, the source hint is configured by the model builder before
 * it delegates to other components that potentially encounter problems. Then, the problem reporter can focus on

 * thrown or a simple string message. In addition, a problem carries a hint about its source, e.g. the settings file
 * that exhibits the problem.
 *
 */
class DefaultProblem implements Problem {

    private final String source;

    private final int lineNumber;

    private final int columnNumber;

    private final String message;

    private final Exception exception;

 * calculate the execution plan, but custom lifecycles can use alternative mapping strategies.
 */
@Named(DefaultLifecycleMappingDelegate.HINT)
@Singleton
public class DefaultLifecycleMappingDelegate implements LifecycleMappingDelegate {
    public static final String HINT = "default";

    private final BuildPluginManager pluginManager;

    @Inject