<pomVsSettings>pom</pomVsSettings>
      </properties>
    </profile>
  </profiles>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-expression</artifactId>
        <version>2.1-SNAPSHOT</version>
        <executions>
          <execution>
            <phase>validate</phase>
            <goals>

        if (getBuildPlugins() != null) {
            for (Plugin plugin : getBuildPlugins()) {
                if (pluginGroupId.equals(plugin.getGroupId()) && pluginArtifactId.equals(plugin.getArtifactId())) {
                    dom = (Xpp3Dom) plugin.getConfiguration();

                    if (executionId != null) {
                        for (PluginExecution execution : plugin.getExecutions()) {

  <version>8-SNAPSHOT</version>
  <packaging>pom</packaging>
  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.codehaus.plexus</groupId>
          <artifactId>plexus-component-metadata</artifactId>
          <version>1.4.0</version>
        </plugin>
        </plugins>
    </pluginManagement>
  </build>

            this.logger.error(
                    String.format("Invalid version specification '%s' creating plugin artifact '%s'.", version, plugin),
                    e);

            return null;
        }

        return artifactFactory.createPluginArtifact(plugin.getGroupId(), plugin.getArtifactId(), versionRange);
    }

 Plugins should avoid these classes and be updated to use only Maven3 dependencies (and require Maven3): see
 {{{https://cwiki.apache.org/confluence/display/MAVEN/Plugin+migration+to+Maven3+dependencies} Plugin migration to Maven3 dependencies}}

                    if (versions.get(key) == null) {
                        versions.put(key, plugin.getVersion());
                        plugins.put(key, plugin);
                    }
                }
                PluginManagement mgmt = build.getPluginManagement();
                if (mgmt != null) {
                    for (Plugin plugin : mgmt.getPlugins()) {
                        String key = plugin.getKey();

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

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

import java.util.concurrent.atomic.AtomicReference;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.LegacySupport;
import org.eclipse.aether.RepositorySystemSession;

/**

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin;

import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;

      </extension>
    </extensions>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-release-plugin</artifactId>
        <configuration>
          <tagBase>https://svn.codehaus.org/plexus/tags</tagBase>
        </configuration>
      </plugin>
    </plugins>
  </build>

    <testResources>
      <testResource>
        <directory>res/test</directory>
      </testResource>
    </testResources>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-expression</artifactId>
        <version>2.1-SNAPSHOT</version>
        <executions>
          <execution>
            <phase>validate</phase>
            <goals>