how to set classpath properly in maven-javadoc-plugin?

Question

I had a customized java doclet, it will call newInstance() on some classes:

clazz.newInstance()

When I ran it in Eclipse as Junit, it works well.

But When I ran it in maven , it throws an exception: NoClassDefFoundError

I checked that class, it is not in my current project, it is inside a maven dependency (third party jar).

I knew I can set classpath in maven-javadoc-plugin. But my project has more than 50 third party jars. How can I set those jars easily?

This is my code in maven pom:

            <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-javadoc-plugin</artifactId>
            <version>3.0.0-M1</version>
            <configuration>
                <doclet>my.company.common.doclet.MyDoclet</doclet>

                <docletPath>${project.build.directory}/../../shared-java/target/classes;${project.build.directory}/classes</docletPath>
                <sourcePath>${project.build.directory}/../../shared-java/src/java;${project.build.directory}/../src/java</sourcePath>
                <encoding>UTF-8</encoding>
                <show>public</show>
                <subpackages>my.company.api</subpackages>
                <useStandardDocletOptions>false</useStandardDocletOptions>
                <docletArtifacts>                       
                    <dependency>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                        <version>${log4j.version}</version>
                    </dependency>                       
                </docletArtifacts>

            </configuration>
            <executions>
                <execution>
                    <id>attach-javadoc</id>
                    <phase>post-integration-test</phase>
                    <goals>
                        <goal>jar</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

Thanks!

Answer 1

I found the maven-javadoc-plugin do pass the whole classpath to my doclet. But the doclet ClassLoader.getSystemClassLoader() didn't use that classpath.

So I have to manually add those classpath into the current classLoader.

In Eclipse, it will automatically set those classpath.