String groupId,
            String artifactId,
            VersionRange versionRange,
            String type,
            String classifier,
            String scope,
            boolean optional) {
        return createArtifactX(groupId, artifactId, versionRange, type, classifier, scope, null, optional);
    }

    private Artifact createProjectArtifactX(String groupId, String artifactId, String version) {

    /**
     * Gets the type of the constituent's artifact.
     *
     * @return The type, never {@code null}.
     */
    String getType();

    /**
     * Gets the classifier of the constituent's artifact.
     *
     * @return The classifier or an empty string, never {@code null}.
     */
    String getClassifier();

    /**
     * Gets the version of the constituent's artifact.
     *

        a = artifactFactory.createArtifactWithClassifier("groupId", "a", "0.0.1-SNAPSHOT", "jar", "classifier");
        file = new File(localRepository.getBasedir(), localRepository.pathOf(a));
        a.setFile(file);

        assertEquals(
                "a-0.0.1-SNAPSHOT-classifier.jar.lastUpdated",
                updateCheckManager.getTouchfile(a).getName());
    }

    Artifact createArtifactWithClassifier(
            String groupId, String artifactId, String version, String type, String classifier);

    Artifact createDependencyArtifact(
            String groupId, String artifactId, VersionRange versionRange, String type, String classifier, String scope);

    Artifact createDependencyArtifact(
            String groupId,
            String artifactId,

      <fields>
        <field>
          <name>classifier</name>
          <version>1.1.0+</version>
          <type>String</type>
          <description>The classifier of the sub-artifact. Each classifier and extension pair may only appear once.</description>
          <defaultValue></defaultValue>
          <identifier>true</identifier>

        }

        return pomArtifact;
    }

    /**
     * Creates POM artifact out of passed in artifact by dropping classifier (if exists) and rewriting extension to
     * "pom". Unconditionally, unlike {@link #toPomArtifact(Artifact)} that does this only for artifacts without
     * classifiers.
     *
     * @since 4.0.0
     */
    public static Artifact toPomArtifactUnconditionally(Artifact artifact) {

    <dependency>
      <groupId>org.eclipse.sisu</groupId>
      <artifactId>org.eclipse.sisu.inject</artifactId>
      <classifier>no_asm</classifier>
    </dependency>
    <dependency>
      <groupId>com.google.inject</groupId>
      <artifactId>guice</artifactId>
      <classifier>classes</classifier>
    </dependency>
    <dependency>
      <groupId>org.ow2.asm</groupId>
      <artifactId>asm</artifactId>

synchronized class MyArtifactFactory implements org.apache.maven.artifact.factory.ArtifactFactory { private static final boolean OPTIONAL = 0; private static final org.apache.maven.artifact.handler.ArtifactHandler HANDLER; private static final String CLASSIFIER; private static final String TYPE = jar; private static final String SCOPE = compile; private static final org.apache.maven.artifact.versioning.VersionRange VERSION; private static final String AID = test-artifact; private static final String GID...

synchronized class MyArtifactFactory implements org.apache.maven.artifact.factory.ArtifactFactory { private static final boolean OPTIONAL = 0; private static final org.apache.maven.artifact.handler.ArtifactHandler HANDLER; private static final String CLASSIFIER; private static final String TYPE = jar; private static final String SCOPE = compile; private static final org.apache.maven.artifact.versioning.VersionRange VERSION; private static final String AID = test-artifact; private static final String GID...

        }

        ArtifactHandler handler = newHandler(artifact);

        /*
         * NOTE: From Artifact.hasClassifier(), an empty string and a null both denote "no classifier". However, some
         * plugins only check for null, so be sure to nullify an empty classifier.
         */
        org.apache.maven.artifact.Artifact result = new org.apache.maven.artifact.DefaultArtifact(
                artifact.getGroupId(),