import java.util.Arrays;
import java.util.List;

import org.apache.maven.execution.AbstractExecutionListener;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.execution.ProjectDependencyGraph;

            <version>1.5.0</version>
            <scope>system</scope>
            <systemPath>${basedir}/tools.jar</systemPath>
          </dependency>
        </dependencies>
        <executions>
          <execution>
            <id>load</id>
            <phase>validate</phase>
            <configuration>
              <resourcePaths>maven-core-it.properties</resourcePaths>

import org.apache.maven.api.Project;
import org.apache.maven.api.Service;
import org.apache.maven.api.services.MavenException;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.execution.MojoExecutionEvent;
import org.apache.maven.execution.MojoExecutionListener;
import org.apache.maven.execution.scope.internal.MojoExecutionScope;
import org.apache.maven.internal.impl.DefaultLog;
import org.apache.maven.internal.impl.DefaultMojoExecution;

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

import java.util.concurrent.atomic.AtomicInteger;

import com.google.inject.Key;
import org.apache.maven.execution.MojoExecutionEvent;
import org.apache.maven.execution.scope.WeakMojoExecutionListener;
import org.apache.maven.plugin.MojoExecutionException;
import org.junit.jupiter.api.Test;

import org.apache.maven.di.Injector;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenExecutionRequestPopulator;
import org.apache.maven.execution.scope.internal.MojoExecutionScope;
import org.apache.maven.execution.scope.internal.MojoExecutionScopeModule;
import org.apache.maven.extension.internal.CoreExports;

                for (PluginExecution execution : plugin.getExecutions()) {
                    Xpp3Dom executionConfiguration = (Xpp3Dom) execution.getConfiguration();

                    executionConfiguration =
                            Xpp3Dom.mergeXpp3Dom(executionConfiguration, new Xpp3Dom(pluginConfiguration));

                    execution.setConfiguration(executionConfiguration);
                }

 * Uses external tools through command execution to generate thumbnail images from documents.
 */
public class CommandGenerator extends BaseThumbnailGenerator {
    private static final Logger logger = LogManager.getLogger(CommandGenerator.class);

    /** List of command strings to execute for thumbnail generation. */
    protected List<String> commandList;

    /** Timeout for command execution in milliseconds. */

  /* use AbstractService for state management */
  private final Service delegate =
      new AbstractService() {
        @Override
        protected final void doStart() {
          Executor executor = renamingDecorator(executor(), () -> serviceName());
          executor.execute(
              () -> {
                try {
                  startUp();
                  notifyStarted();

    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-dependency-resolution</artifactId>
        <version>2.1-SNAPSHOT</version>
        <executions>
          <execution>
            <id>compile-classpath</id>
            <phase>validate</phase>
            <goals>
              <goal>compile</goal>
            </goals>
            <configuration>

                    <groupId>${codehaus.groupId}</groupId>
                    <artifactId>build-helper-maven-plugin</artifactId>
                    <version>3.2.0</version>
                    <executions>
                        <execution>
                            <id>add-source-config</id>
                            <phase>generate-sources</phase>
                            <goals>
                                <goal>add-source</goal>