~~ under the License.

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 Maven Core Extensions Reference
 ---
 Hervé Boutemy
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 2016-06-25
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Maven Core Extensions Reference

  Maven core provides default {{{./extension.html}extensions}} as defined in <<</META-INF/maven/extension.xml>>>:

  <description>
    Test that build extensions are properly merged during inheritance.
  </description>

  <build>
    <!-- project extensions should precede inherited extensions -->
    <extensions>
      <extension>
        <groupId>org.apache.maven.its.mng3899</groupId>
        <artifactId>b</artifactId>
        <version>0.1</version>
      </extension>
      <extension>

  <groupId>org.apache.maven.test</groupId>
  <artifactId>project-with-build-extensions-plugin</artifactId>
  <version>1.0</version>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin</artifactId>
        <version>0.1</version>
        <extensions>true</extensions>
        <executions>
          <execution>
            <id>load</id>

import org.apache.maven.execution.MavenSession;

/**
 * Allows core extensions to participate in Maven build session lifecycle.
 *
 * All callback methods (will) follow beforeXXX/afterXXX naming pattern to
 * indicate at what lifecycle point it is being called.
 *
 * @see <a href="https://maven.apache.org/examples/maven-3-lifecycle-extensions.html">example</a>
 * @see <a href="https://issues.apache.org/jira/browse/MNG-4224">MNG-4224</a>

      <item name="Source Xref" href="xref/index.html"/>
      <!--item name="FAQ" href="faq.html"/-->
    </menu>

    <menu name="Reference">
      <item name="Core Extensions" href="core-extensions.html"/>
      <item name="Extension Descriptor" href="extension.html"/>
    </menu>
  </body>

  <name>Maven Integration Test :: MNG-3899</name>
  <description>
    Test that build extensions are properly merged during inheritance.
  </description>

  <build>
    <extensions>
      <extension>
        <groupId>org.apache.maven.its.mng3899</groupId>
        <artifactId>a</artifactId>
        <version>0.1</version>
      </extension>
      <extension>
        <groupId>org.apache.maven.its.mng3899</groupId>

        if (build != null) {
            for (Extension extension : build.getExtensions()) {
                Plugin plugin = new Plugin();
                plugin.setGroupId(extension.getGroupId());
                plugin.setArtifactId(extension.getArtifactId());
                plugin.setVersion(extension.getVersion());
                XmlNode configuration = extension.getDelegate().getConfiguration();

Use this directory to add third party extensions to Maven Core. These extensions can either extend or override

    }

    /**
     * Returns artifacts exported by Maven core and core extensions. Artifacts are identified by their
     * groupId:artifactId string key.
     */
    public Set<String> getExportedArtifacts() {
        return artifacts;
    }

    /**
     * Returns packages exported by Maven core and core extensions.
     */
    public Map<String, ClassLoader> getExportedPackages() {
        return packages;

 * under the License.
 */
package org.apache.maven.execution;

import org.apache.maven.lifecycle.LifecycleExecutionException;

/**
 * <p>
 * Extension point that allows build extensions observe and possibly veto project build execution.
 * </p>
 * <strong>Note:</strong> This interface is part of work in progress and can be changed or removed without notice.
 *
 * @see ExecutionListener