}

    static class GAKey {
        private final String groupId;
        private final String artifactId;
        private final int hashCode;

        GAKey(String groupId, String artifactId) {
            this.groupId = groupId;
            this.artifactId = artifactId;
            this.hashCode = Objects.hash(groupId, artifactId);
        }

        @Override
        public int hashCode() {

  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.apache.maven</groupId>
    <artifactId>maven</artifactId>
    <version>4.0.0-beta-6-SNAPSHOT</version>

    <relativePath>../../</relativePath>
  </parent>

  <artifactId>maven-builder-support</artifactId>

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.group</groupId>
  <artifactId>testvalidpom</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <description>
    This will test if the module validator recognized that this dependency with classifier
    is not the same as the module itself.
  </description>
  <dependencies>
    <dependency>
      <groupId>com.example.group</groupId>
      <artifactId>testvalidpom</artifactId>

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.group</groupId>
  <artifactId>testinvalidpom</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <description>
    This will test if the module validator recognized that this
    dependency is the same as the module itself.
  </description>
  <dependencies>
    <dependency>
      <groupId>com.example.group</groupId>
      <artifactId>testinvalidpom</artifactId>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>scope-default</artifactId>
  <version>1.0</version>
  <dependencies>

    <dependency>
      <groupId>maven-test-default</groupId>
      <artifactId>scope-default</artifactId>
      <version>1.0</version>
    </dependency>

    <dependency>
      <groupId>maven-test-default</groupId>
      <artifactId>scope-test</artifactId>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>scope-test</artifactId>
  <version>1.0</version>
  <dependencies>

    <dependency>
      <groupId>maven-test-test</groupId>
      <artifactId>scope-default</artifactId>
      <version>1.0</version>
    </dependency>

    <dependency>
      <groupId>maven-test-test</groupId>
      <artifactId>scope-test</artifactId>

     * @param model The model to wrap, may be {@code null}.
     * @param groupId The effective group identifier of the model, may be {@code null}.
     * @param artifactId The effective artifact identifier of the model, may be {@code null}.
     * @param version The effective version of the model, may be {@code null}.
     */
    ModelData(Source source, Model model, String groupId, String artifactId, String version) {
        this.source = source;

     * @return The user-friendly artifact id, never {@code null}.
     */
    static String toId(String groupId, String artifactId, String version) {
        StringBuilder buffer = new StringBuilder(128);

        buffer.append((groupId != null && !groupId.isEmpty()) ? groupId : "[unknown-group-id]");
        buffer.append(':');
        buffer.append((artifactId != null && !artifactId.isEmpty()) ? artifactId : "[unknown-artifact-id]");

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t07-c</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t07-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

    <artifactId>p0</artifactId>
    <groupId>maven-t08</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-t08</groupId>
  <artifactId>p1</artifactId>
  <packaging>pom</packaging>
  <name>p1</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>maven-test</groupId>