in maven-jxr-plugin/src/main/java/org/apache/maven/plugin/jxr/AbstractJxrReport.java [432:444]
protected List<String> constructSourceDirs() {
List<String> sourceDirs = new ArrayList<>(getSourceRoots());
if (isAggregate()) {
for (MavenProject project : reactorProjects) {
if ("java".equals(project.getArtifact().getArtifactHandler().getLanguage())) {
sourceDirs.addAll(getSourceRoots(project));
}
}
}
sourceDirs = pruneSourceDirs(sourceDirs);
return sourceDirs;
}