Affects both 2.0.2.Final and `main`.

The aggregate reports doesn't build:
mvn clean install -DskipTests javadoc:aggregate

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.397 s
[INFO] Finished at: 2024-09-18T10:58:22+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.7.0:aggregate (default-cli) on project mod_cluster-parent: An error has occurred in Javadoc report generation:
[ERROR] Exit code: 1
[ERROR] warning: The -footer option is no longer supported and will be ignored.
[ERROR] It may be removed in a future release.
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/TomcatContext.java:11: error: package javax.servlet does not exist
[ERROR] import javax.servlet.ServletException;
[ERROR] ^
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/TomcatContext.java:56: error: cannot find symbol
[ERROR] public void invoke(Request request, Response response) throws IOException, ServletException {
[ERROR] ^
[ERROR] symbol: class ServletException
[ERROR] location: class RequestListenerValve
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/JavaxHttpSessionListener.java:7: error: package javax.servlet.http does not exist
[ERROR] import javax.servlet.http.HttpSessionEvent;
[ERROR] ^
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/JavaxHttpSessionListener.java:16: error: package javax.servlet.http does not exist
[ERROR] public class JavaxHttpSessionListener implements javax.servlet.http.HttpSessionListener {
[ERROR] ^
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/JavaxHttpSessionListener.java:25: error: cannot find symbol
[ERROR] public void sessionCreated(HttpSessionEvent se) {
[ERROR] ^
[ERROR] symbol: class HttpSessionEvent
[ERROR] location: class JavaxHttpSessionListener
[ERROR] /Users/rhusar/git/mod_cluster/container/tomcat-9.0/src/main/java/org/jboss/modcluster/container/tomcat/JavaxHttpSessionListener.java:30: error: cannot find symbol
[ERROR] public void sessionDestroyed(HttpSessionEvent se) {
[ERROR] ^
[ERROR] symbol: class HttpSessionEvent
[ERROR] location: class JavaxHttpSessionListener
[ERROR] 6 errors
[ERROR] 1 warning
[ERROR] Command line was: /Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home/bin/javadoc @options @packages
[ERROR]
[ERROR] Refer to the generated Javadoc files in '/Users/rhusar/git/mod_cluster/target/site/apidocs' dir.
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException