Confluence 3.x and com.atlassian.confluence.content.render.xhtml

pom.xml

<plugin>
    <groupId>com.atlassian.maven.plugins</groupId>
    <artifactId>maven-confluence-plugin</artifactId>
    <version>3.8</version>
    <extensions>true</extensions>
    <configuration>
        <instructions>
            <Import-Package>
                com.atlassian.confluence.content.render.xhtml;resolution:=optional;version="0.0.0",
                *;version="0.0"
            </Import-Package>
        </instructions>
    </configuration>
</plugin>