import org.apache.maven.wagon.UnsupportedProtocolException;
import org.apache.maven.wagon.Wagon;
import org.apache.maven.wagon.authentication.AuthenticationException;
import org.apache.maven.wagon.authentication.AuthenticationInfo;
import org.apache.maven.wagon.authorization.AuthorizationException;
import org.apache.maven.wagon.events.TransferListener;
import org.apache.maven.wagon.observers.ChecksumObserver;
import org.apache.maven.wagon.proxy.ProxyInfo;

@REM under the License.

@REM -----------------------------------------------------------------------------
@REM Apache Maven Startup Script
@REM
@REM Environment Variable Prerequisites
@REM
@REM   JAVA_HOME         (Optional) Points to a Java installation.
@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.

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t05-c</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t05-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t08-c</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t08-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.execution;

/**
 * Defines events that Maven fires during a build. <strong>Warning:</strong> This interface might be extended in future
 * Maven versions to support further events. Hence it is strongly recommended to derive custom listeners from

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.aether;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.internal.transformation.ConsumerPomArtifactTransformer;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.impl.Installer;

import org.eclipse.aether.impl.MetadataGeneratorFactory;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven G level metadata generator factory.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Named(PluginsMetadataGeneratorFactory.NAME)
@Singleton
@Deprecated(since = "4.0.0")
public class PluginsMetadataGeneratorFactory implements MetadataGeneratorFactory {

import org.eclipse.aether.impl.MetadataGeneratorFactory;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven GAV level metadata generator factory.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Named(SnapshotMetadataGeneratorFactory.NAME)
@Singleton
@Deprecated(since = "4.0.0")
public class SnapshotMetadataGeneratorFactory implements MetadataGeneratorFactory {

import org.eclipse.aether.impl.MetadataGeneratorFactory;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven GA level metadata generator factory.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Named(VersionsMetadataGeneratorFactory.NAME)
@Singleton
@Deprecated(since = "4.0.0")
public class VersionsMetadataGeneratorFactory implements MetadataGeneratorFactory {

 * under the License.
 */
package org.apache.maven.toolchain.io;

import javax.inject.Named;
import javax.inject.Singleton;
import javax.xml.stream.XMLStreamException;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;
import java.util.Objects;

import org.apache.maven.toolchain.model.PersistedToolchains;
import org.apache.maven.toolchain.v4.MavenToolchainsStaxWriter;

/**