String[] p = mojo.getGoal().trim().split(":");
                if (p.length == 3) {
                    // <groupId>:<artifactId>:<goal>
                    groupId = p[0];
                    artifactId = p[1];
                    version = null;
                    goal = p[2];
                } else if (p.length == 4) {
                    // <groupId>:<artifactId>:<version>:<goal>
                    groupId = p[0];

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <executions>
          <execution>
            <id>default-compile</id>
            <goals>
              <goal>compile</goal>
            </goals>
            <configuration>
              <release>8</release>
              <excludes>
                <exclude>module-info.java</exclude>
              </excludes>

            <phase>initialize</phase>
            <goals>
              <goal>set</goal>
            </goals>
            <configuration>
              <mainFile>dependency-classes</mainFile>
            </configuration>
          </execution>
          <execution>
            <id>install</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>set</goal>
              <goal>attach-pom</goal>

            if (context.options().goals().isEmpty()
                    || context.options().goals().get().size() != 1) {
                return badGoalsErrorMessage("No goal or multiple goals specified, specify only one goal.", context);
            }

            String goalName = context.options().goals().get().get(0);
            Goal goal = context.goals.get(goalName);

            if (goal == null) {

    private String goal;

    private PluginDescriptor pluginDescriptor;

    public MojoNotFoundException(String goal, PluginDescriptor pluginDescriptor) {
        super(toMessage(goal, pluginDescriptor));

        this.goal = goal;
        this.pluginDescriptor = pluginDescriptor;
    }

    public String getGoal() {
        return goal;
    }

              <goals>
                <goal>xdoc</goal>
                <goal>xsd</goal>
              </goals>
            </execution>
            <execution>
              <id>standard</id>
              <goals>
                <goal>java</goal>
                <goal>xpp3-reader</goal>
                <goal>xpp3-writer</goal>
              </goals>
            </execution>

        return !session.getRequest().isProjectPresent();
    }

    private boolean requiresProject(MavenSession session) {
        List<String> goals = session.getGoals();
        if (goals != null) {
            for (String goal : goals) {
                if (!isGoalSpecification(goal)) {
                    return true;
                }
            }
        }
        return false;
    }

 */
package org.apache.maven.cling.invoker.mvnup.goals;

import org.apache.maven.api.di.Named;
import org.apache.maven.api.di.Singleton;
import org.apache.maven.cling.invoker.mvnup.Goal;
import org.apache.maven.cling.invoker.mvnup.UpgradeContext;

/**
 * The "help" goal implementation.
 */
@Named("help")
@Singleton
public class Help implements Goal {

    @Override

              <goals>
                <goal>xdoc</goal>
                <goal>xsd</goal>
              </goals>
            </execution>
            <execution>
              <id>standard</id>
              <goals>
                <goal>java</goal>
                <goal>xpp3-reader</goal>
                <goal>xpp3-writer</goal>
              </goals>
            </execution>

            if (context.options().goals().isEmpty()) {
                return badGoalsErrorMessage("No goals specified.", context);
            }

            String goalName = context.options().goals().get().get(0);
            Goal goal = context.goals.get(goalName);
            if (goal == null) {
                return badGoalsErrorMessage("Unknown goal: " + goalName, context);
            }