This is really cool: http://www.umldesigner.org/ref-doc/define-the-system.html#Dashboard

Eclipse plugin. Goto marketplace and look for uml designer.

• Create new uml project
• Select model
• Finish, then a model.uml file and a dashboard is shown.

• http://lightuml.sourceforge.net/
• http://java.dzone.com/articles/reverse-engineer-source-code-u

1. Install Graphviz. After installation confirm that it is part of your PATH.
2. Configure your maven pom files to make sure that you can get to the following repository: http://mirrors.ibiblio.org/pub/mirrors/maven2 because it has the second piece of the puzzle, the binaries for UMLGraph. You can see all the options for use in <additionalparam/> here.
3. To generate UML diagrams as part of the “mvn javadoc:javadoc” command, add the following (+/-) to your pom.xml file's <build/> section.

          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-javadoc-plugin</artifactId>
            <configuration>
              <doclet>org.umlgraph.doclet.UmlGraphDoc</doclet>
              <docletArtifact>
                <groupId>org.umlgraph</groupId>
                <artifactId>doclet</artifactId>
                <version>5.1</version>
              </docletArtifact>
              <additionalparam>-views</additionalparam>
              <destDir>target/uml</destDir>
              <show>private</show>
            </configuration>
          </plugin>
          </plugins>
          </reporting>

1. To generate UML diagrams as part of the “mvn site” command, add the following (+/-) to your pom.xml file's <reporting/> section.

    <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>2.8.1</version> 
        <reportSets>
          <reportSet>
            <id>uml</id>
            <configuration>
              <doclet>org.umlgraph.doclet.UmlGraphDoc</doclet>
              <docletArtifact>
                <groupId>org.umlgraph</groupId>     
                <artifactId>umlgraph</artifactId>     
                <version>5.6.6</version>   
              </docletArtifact>
              <additionalparam>-views -constructors</additionalparam>
              <useStandardDocletOptions>false</useStandardDocletOptions>
              <destDir>target/uml</destDir>
              <show>private</show>
            </configuration>
            <reports>
              <report>javadoc</report>
            </reports>
          </reportSet>
        </reportSets>
      </plugin>
    </plugins>
  </reporting>

1. Run mvn site
2. That's it, you should now be reaping the benefits as your javadocs will have UML diagrams inside each class's landing page. I used the following post to put all this info together: http://wiki.wsmoak.net/cgi-bin/wiki.pl?UMLGraph

http://www.umlgraph.org/doc/cd-opt.html