Asciidoctorj + diagram + pdf

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.asciidoctor.maven</groupId>
    <artifactId>asciidoctor-diagram-example</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>Asciidoctor Diagram Maven example</name>
    <description>An example project that demonstrates how to integrate Asciidoctor Diagram with the Asciidoctor Maven plugin.</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <asciidoctor.maven.plugin.version>1.5.4-SNAPSHOT</asciidoctor.maven.plugin.version>
        <asciidoctorj.version>1.5.4</asciidoctorj.version>
        <asciidoctorj.diagram.version>1.3.1</asciidoctorj.diagram.version>
        <jruby.version>1.7.21</jruby.version>
        <asciidoctorj.pdf.version>1.5.0-alpha.11</asciidoctorj.pdf.version>
    </properties>

    <build>
        <defaultGoal>process-resources</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.asciidoctor</groupId>
                <artifactId>asciidoctor-maven-plugin</artifactId>
                <version>${asciidoctor.maven.plugin.version}</version>
                <dependencies>
                    <!-- Comment this section to use the default jruby artifact provided by the plugin -->
                    <!--
                    <dependency>
                        <groupId>org.jruby</groupId>
                        <artifactId>jruby-complete</artifactId>
                        <version>${jruby.version}</version>
                    </dependency>
                    -->
                    <!-- Comment this section to use the default AsciidoctorJ artifact provided by the plugin -->
                    <dependency>
                        <groupId>org.asciidoctor</groupId>
                        <artifactId>asciidoctorj</artifactId>
                        <version>${asciidoctorj.version}</version>
                    </dependency>
                    <dependency>
                        <groupId>org.asciidoctor</groupId>
                        <artifactId>asciidoctorj-diagram</artifactId>
                        <version>${asciidoctorj.diagram.version}</version>
                    </dependency>
                    <dependency>
                        <groupId>org.asciidoctor</groupId>
                        <artifactId>asciidoctorj-pdf</artifactId>
                        <version>${asciidoctorj.pdf.version}</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <sourceDirectory>src/docs/asciidoc</sourceDirectory>
                    <requires>
                        <require>asciidoctor-diagram</require>
                    </requires>
                    <attributes>
                    </attributes>
                </configuration>
                <executions>
                    <execution>
                        <id>generate-pdf-doc</id>
                        <phase>generate-resources</phase>
                        <goals>
                            <goal>process-asciidoc</goal>
                        </goals>
                        <configuration>
                            <backend>pdf</backend>
                            <attributes>
                                <imagesdir>${project.build.directory}/generated-docs/images</imagesdir>
                                <!-- In case a different path is used for the output, imagesoutdit must be set to the same as imagesdir -->
                                <!--<imagesoutdir>${project.build.directory}/generated-docs/images</imagesoutdir>-->
                                <toc>left</toc>
                                <icons>font</icons>
                                <sectanchors>true</sectanchors>
                                <idprefix/>
                                <idseparator>-</idseparator>
                            </attributes>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Thank you very much!