 ------
 Aggregating Javadocs for Multi-Projects
 ------
 Maria Odea Ching
 Vincent Siveton
 ------
 2009-08-04
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Aggregating Javadocs For Multi-Projects

 For example, consider the following directory structure:

+-----+

Project
  |-- pom.xml
  |-- Module1
  |   `-- pom.xml
  |   `-- Module 2
  |       `-- pom.xml
  |   `-- Module 3
  |       `-- pom.xml
  |-- Module4
  |   `-- pom.xml
  `-- Module5
    `-- pom.xml

+-----+

* Using The \<aggregate/\> Parameter (<<deprecated>>)

 <<Note>>: {{{../javadoc-mojo.html#aggregate}\<aggregate/\>}} parameter is <<deprecated>> since 2.5. Please use the
 <<<aggregate>>> goal instead of.

 The {{{../javadoc-mojo.html#aggregate}\<aggregate/\>}} parameter can be used to generate javadocs for multi-module
 projects. It gives the option to generate one javadoc report for the entire project (all modules) or generate one 
 javadoc report for each module. Since 3.1.0 the <<<aggregate>>> has changed a little bit. It'll generate aggregated 
 reports at every level.
 To get only an aggregated project at root level, you need to configure the pom like:
 
 +-----+
<project>
  ...
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>${project.version}</version>
        <reportSets>
          <reportSet>
            <id>aggregate</id>
            <inherited>false</inherited>        
            <reports>
              <report>aggregate</report>
            </reports>
          </reportSet>
          <reportSet>
            <id>default</id>
            <reports>
              <report>javadoc</report>
            </reports>
          </reportSet>
        </reportSets>
      </plugin>
    </plugins>
    ...
  </reporting>
  ...
</project>
+-----+

 When you execute javadoc:javadoc from Project directory with aggregate set to <<true>>, a javadoc report will be created
 in the target directory of Project with all the javadocs of Project's modules included. If aggregate is
 set to <<false>> (default), a javadoc report for Module1 will be generated in the target directory of Module1, a javadoc
 report for Module2 will be generated in the target directory of Module2, and a javadoc report for Module3 will be
 generated in the target directory of Module3.

+-----+
<project>
  ...
  <reporting> (or <build>)
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>${project.version}</version>
        <configuration>
          ...
          <aggregate>true</aggregate>
          ...
        </configuration>
      </plugin>
    </plugins>
    ...
  </reporting> (or </build>)
  ...
</project>
+-----+

* Using The <<<aggregate>>> Goals

 The {{{../javadoc-mojo.html#aggregate}\<aggregate/\>}} parameter doesn't include generate source directories defined
 using the {{{http://mojo.codehaus.org/build-helper-maven-plugin/add-source-mojo.html}build-helper:add-source}}. In
 this case, you need to use the <<<aggregate>>> goal and <<<test-aggregate>>> goals. You could define these goals in the
 \<build/\> element (using the \<execution/\> tag) or \<reporting/\> element (using the \<reportSet/\> tag) as shown
 below. For more information, refer to the {{{./selective-javadocs-report.html}Selective Javadocs Reports page}}.

+-----+
<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>${project.version}</version>
        <configuration>
          <!-- Default configuration for all reports -->
          ...
        </configuration>
        <executions>
          <execution>
            <id>aggregate</id>
            <goals>
              <goal>aggregate</goal>
            </goals>
            <phase>site</phase>
            <configuration>
              <!-- Specific configuration for the aggregate report -->
              ...
            </configuration>
          </execution>
          ...
        </executions>
      </plugin>
      ...
    </plugins>
  </build>
  ...
</project>
+-----+

+-----+

<project>
  ...
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>${project.version}</version>
        <configuration>
          <!-- Default configuration for all reports -->
          ...
        </configuration>
        <reportSets>
          <reportSet>
            <id>non-aggregate</id>
            <configuration>
              <!-- Specific configuration for the non aggregate report -->
              ...
            </configuration>
            <reports>
              <report>javadoc</report>
            </reports>
          </reportSet>
          <reportSet>
            <id>aggregate</id>
            <configuration>
              <!-- Specific configuration for the aggregate report -->
              ...
            </configuration>
            <reports>
              <report>aggregate</report>
            </reports>
          </reportSet>
          ...
        </reportSets>
      </plugin>
      ...
    </plugins>
  </reporting>
  ...
</project>
+-----+

 The Javadoc plugin contains several <<<aggregate>>> goals to be use with an aggregator project. Here is the full list
 of all <<<aggregate>>> goals:

   * {{{../aggregate-mojo.html}javadoc:aggregate}} to generate the Javadoc files.

   * {{{../test-aggregate-mojo.html}javadoc:test-aggregate}} to generate the test Javadoc files.

   * {{{../aggregate-jar-mojo.html}javadoc:aggregate-jar}} to create an archive file of the Javadoc files.

   * {{{../test-aggregate-jar-mojo.html}javadoc:test-aggregate-jar}} to create an archive file of the test Javadoc files.

   []