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README.md

Overview

Add UML diagrams (using PlantUML) to Javadocs. Extends the standard Java doclet.

Background

The inspiration for this project is better communication between the developers on my team. We want to follow the principles of DDD and Model-Driven Design (https://www.amazon.ca/Domain-Driven-Design-Tackling-Complexity-Software/dp/0321125215/ref=sr_1_1?s=books&ie=UTF8&qid=1475876769&sr=1-1&keywords=domain+driven+design) and automatically generating class diagrams is a key part of that approach.

Diagrams

Generates three types of diagrams:

  • Overview: Shows all classes within all packages. Click on a class to get to the Javadoc for that class. Click on a package to get to the Javadoc for that package.
  • Package: Shows all of the classes within a package, and the relationships between them. Does not show relationships with classes outside the package.
  • Class: Shows all of the relationships with other classes. If the other class is in the same package, it is shown in yellow (default color). If in another package within the set of packages, it is shown in white. If the other class is outside any of the packages, it is shown in grey.

The relationships with other classes are determined by what the Javadoc API provides, which is from the attribute and method declarations for a class. Any usages that are buried within code will not be shown. If I think a relationship is important enough to be shown, I will make it explicit (e.g. add an attribute to the other class).

Layouts can appear strange. This is due to the use of GraphViz. Good enough for my purposes, although there are other options that are being explored (http://plantuml.sourceforge.net/qa/?qa=4842/graphviz-is-not-good-enough).

Dependencies

  • GraphViz (as required by PlantUML).
  • Java 8 (easy enough to backport to earlier versions).

NOTE: The doclet tool was completely changed in Java 9; uml-java-doclet will not work with any JDK later than 8.

Installing

Use http://jitpack.io to automatically build and install the JAR file. Add the JitPack repository to your POM:

<repositories>
	<repository>
	    <id>jitpack.io</id>
	    <url>https://jitpack.io</url>
	</repository>
</repositories> 

Note: Not published to Maven Central; this is a much easier alternative.

Generating Updated Javadocs

To generate UML diagrams for your own project, add the following to your POM:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>                                  
            <artifactId>maven-javadoc-plugin</artifactId>
            <version>3.2.0</version>
            <configuration>
                <doclet>info.leadinglight.umljavadoclet.UmlJavaDoclet</doclet>
                <docletArtifact>
                    <groupId>com.github.gboersma</groupId>
                    <artifactId>uml-java-doclet</artifactId>
                    <version>1.1</version>
                </docletArtifact>
                <useStandardDocletOptions>true</useStandardDocletOptions>
                <additionalOptions>
                    <!-- Specify each diagram option here as an additionOption tag. -->
                </additionalOptions>
            </configuration>
        </plugin>
    </plugins>
</build>

Note: Version 3+ of the maven-javadoc-plugin uses the additionalOptions tag to specify additional javadoc tags. The previous additionalparam tag no longer works correctly. Be sure to upgrade your POMs accordingly.

Diagram Options

Options for the diagrams are specified as additionalOption tags in the POM.

Option Valid Values Default Description
-linetype polyline,spline,ortho ortho Types of lines to display on diagrams
-dependencies public,protected,package,private public What dependencies to explicitly show on the diagram
-package-orientation top-to-bottom,left-to-right top-to-bottom Layout of packages on package diagrams
-output-model true,false false Whether to output the details of the model (useful for debugging)
-puml-include-file free-form none Name of PUML file to include in every diagram PUML
-exclude-classes comma-separated none List of qualified class names to exclude from context diagrams
-exclude-packages comma-separated none List of qualified package names to exclude from context diagrams

Tips

Acknowledgments

Many thanks to the folks at PlantUML (https://github.com/plantuml/plantuml) for their fantastic support. Thanks to @bcopy for the pointer to jitpack.

License

Copyright 2016 Gerald Boersma

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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Doclet to generate UML diagrams for Javadoc using PlantUML.

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