They are replaced in Maven 4 with Maven 4 API Core's {{{../../api/maven-api-core/apidocs/org/apache/maven/api/Type.html}Dependency Types}},
  with default values defined in {{{../../compat/maven-resolver-provider/apidocs/org/apache/maven/repository/internal/type/DefaultTypeProvider.html}DefaultTypeProvider}}.

  For compatibility, legacy Maven 3 artifact handlers are still provided:

import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.lifecycle.LifecycleNotFoundException;
import org.apache.maven.lifecycle.LifecyclePhaseNotFoundException;
import org.apache.maven.lifecycle.internal.GoalTask;
import org.apache.maven.lifecycle.internal.ProjectBuildList;
import org.apache.maven.lifecycle.internal.ProjectSegment;
import org.apache.maven.lifecycle.internal.TaskSegment;

import org.apache.maven.building.Source;
import org.apache.maven.cli.CLIManager;
import org.apache.maven.cli.CliRequest;
import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenExecutionRequestPopulationException;
import org.apache.maven.settings.Mirror;
import org.apache.maven.settings.Profile;
import org.apache.maven.settings.Proxy;
import org.apache.maven.settings.Repository;
import org.apache.maven.settings.Server;

import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.impl.model.reflection.IntrospectionException;
import org.apache.maven.internal.impl.DefaultLookup;
import org.apache.maven.internal.impl.DefaultMojoExecution;
import org.apache.maven.internal.impl.DefaultProject;
import org.apache.maven.internal.impl.DefaultSession;

                    upgrades.stream().anyMatch(upgrade -> "maven-compiler-plugin".equals(upgrade.artifactId()));
            boolean hasExecPlugin =
                    upgrades.stream().anyMatch(upgrade -> "maven-exec-plugin".equals(upgrade.artifactId()));

            assertTrue(hasCompilerPlugin, "Should include maven-compiler-plugin upgrade");
            assertTrue(hasExecPlugin, "Should include maven-exec-plugin upgrade");
        }

 * under the License.
 */
package org.apache.maven.model.normalization;

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

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.model.Build;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Model;
import org.apache.maven.model.Plugin;

 * under the License.
 */
package org.apache.maven.cling.invoker.mvnenc;

import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.function.Consumer;

import org.apache.maven.api.annotations.Nullable;
import org.apache.maven.api.cli.InvokerRequest;
import org.apache.maven.api.cli.mvnenc.EncryptOptions;
import org.apache.maven.api.services.Lookup;
import org.apache.maven.cling.invoker.LookupContext;

 * under the License.
 */
package org.apache.maven.api.plugin;

import java.util.List;

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.plugin.descriptor.lifecycle.Lifecycle;

/**
 * Interface that can be provided by the plugin to wire in custom lifecycles
 * leveraged using the {@link org.apache.maven.api.plugin.annotations.Execute}

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

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Immutable;
import org.apache.maven.api.annotations.Nonnull;

/**
 * <p>In Maven, repositories are locations where project artifacts (such as JAR files, POM files, and other

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

import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.impl.InternalSession;
import org.apache.maven.impl.resolver.scopes.Maven4ScopeManagerConfiguration;