public void mergeManagedBuildPlugins(Model model) {
            Build build = model.getBuild();
            if (build != null) {
                PluginManagement pluginManagement = build.getPluginManagement();
                if (pluginManagement != null) {
                    mergePluginContainerPlugins(build, pluginManagement);
                }
            }
        }

          <!-- use the guava we're building. -->
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.mvnsearch</groupId>
        <artifactId>toolchains-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-toolchains-plugin</artifactId>

        props.put("hamcret.version", "2.1");
        props.put("lombok.version", "1.18.6");
        props.put("junit.version", "4.12");
        Model model = Model.newBuilder(true).properties(props).build();
        String xml = toXml(model);

        for (int i = 0; i < 10; i++) {
            String newStr = toXml(fromXml(xml));
            assertEquals(newStr, xml);
        }
    }

    @Test

* Review in Google Docs is not as simple as a PR code review in GitHub

## Decision

The *Build Tool Team* has decided to use Architectural Decision Records (aka ADR) to track decisions we want to follow.

The main logic with ADRs is to describe (architectural) decisions made:

* To provide best practices and solutions we (as the *build tool* team) want to promote.
* To avoid asking the same thing multiple times during code review.

      <artifactId>t09-a</artifactId>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-antrun-plugin</artifactId>
        <configuration>
          <tasks><echo>${project.parent.basedir}</echo></tasks>
        </configuration>
      </plugin>
    </plugins>
  </build>

                  protected List<String> create(String[] elements) {
                    ImmutableList.Builder<String> builder = ImmutableList.builder();
                    for (int i = elements.length - 1; i >= 0; i--) {
                      builder.add(elements[i]);
                    }
                    return Lists.reverse(builder.build());
                  }
                })
            .named("Lists.reverse[ImmutableList]")

        return BeanUtil.copyBeanToNewBean(src, destClass);
    }

    /**
     * Builds a comprehensive error message from a throwable and its causes.
     * This method traverses the cause chain and concatenates all error messages.
     *
     * @param t the throwable to build message from
     * @return a string containing all error messages in the cause chain
     */

        ActivationFile activationFile =
                ActivationFile.newBuilder().exists(filePath).build();
        return newProfile(activationFile);
    }

    private Profile newMissingProfile(String filePath) {
        ActivationFile activationFile =
                ActivationFile.newBuilder().missing(filePath).build();
        return newProfile(activationFile);
    }

        request.setSystemProperties(SystemProperties.getSystemProperties());
        return build(request);
    }

    @Override
    public Settings buildSettings(File userSettingsFile, boolean useCachedSettings)
            throws IOException, XmlPullParserException {
        return buildSettings(userSettingsFile);
    }

    private Settings build(SettingsBuildingRequest request) throws IOException, XmlPullParserException {
        try {

/**
 * Provides basic services to manage Maven plugins and their mojos. This component is kept general in its design such
 * that the plugins/mojos can be used in arbitrary contexts. In particular, the mojos can be used for ordinary build
 * plugins as well as special purpose plugins like reports.
 *
 * @since 3.0
 */
public interface MavenPluginManager {

    /**
     * Retrieves the descriptor for the specified plugin from its main artifact.