<goal>xsd</goal>
            </goals>
            <phase>generate-sources</phase>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>attach-artifact</goal>
            </goals>

 */
package org.apache.maven.plugin;

import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.model.Plugin;
import org.apache.maven.project.MavenProject;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.graph.DependencyFilter;
import org.eclipse.aether.repository.RemoteRepository;

/**

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

import java.util.List;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.model.Plugin;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.codehaus.plexus.classworlds.realm.ClassRealm;

        Plugin plugin = new Plugin();

        plugin.setGroupId("org.apache.maven.plugins");
        plugin.setArtifactId(artifactId);

        for (String goal : goals) {
            PluginExecution pluginExecution = new PluginExecution();
            pluginExecution.setId("default-" + goal);
            pluginExecution.addGoal(goal);
            plugin.addExecution(pluginExecution);

        } else {
            plugins = Collections.emptySet();
        }

        return plugins;
    }

    private Plugin newPlugin(String artifactId, String... goals) {
        Plugin plugin = new Plugin();

        plugin.setGroupId("org.apache.maven.plugins");
        plugin.setArtifactId(artifactId);

        for (String goal : goals) {
            PluginExecution pluginExecution = new PluginExecution();

    }

    public static int pluginHashCode(Plugin plugin) {
        int hash = 17;

        hash = hash * 31 + Objects.hashCode(plugin.getGroupId());
        hash = hash * 31 + Objects.hashCode(plugin.getArtifactId());
        hash = hash * 31 + Objects.hashCode(plugin.getVersion());

        hash = hash * 31 + (plugin.isExtensions() ? 1 : 0);

        for (Dependency dependency : plugin.getDependencies()) {

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

import java.util.List;
import java.util.Map;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.model.Plugin;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.eclipse.aether.RepositorySystemSession;

        msgs.add("* contains the following plugin(s) that have goals not marked   *");
        msgs.add("* as @threadSafe to support parallel building.                  *");
        msgs.add("* While this /may/ work fine, please look for plugin updates    *");
        msgs.add("* and/or request plugins be made thread-safe.                   *");
        msgs.add("* If reporting an issue, report it against the plugin in        *");

    <system>GitHub Issues</system>
    <url>https://github.com/google/guava/issues</url>
  </issueManagement>

  <properties>
    <central-publishing-maven-plugin.version>0.9.0</central-publishing-maven-plugin.version>
    <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.google.guava</groupId>

        "compile", "org.apache.maven.plugins:maven-compiler-plugin:" + COMPILER_PLUGIN_VERSION + ":compile",
        "process-test-resources",
                "org.apache.maven.plugins:maven-resources-plugin:" + RESOURCES_PLUGIN_VERSION + ":testResources",
        "test-compile", "org.apache.maven.plugins:maven-compiler-plugin:" + COMPILER_PLUGIN_VERSION + ":testCompile",