in maven-jxr-plugin/src/main/java/org/apache/maven/plugin/jxr/JxrReport.java [93:107]
protected List<String> getSourceRoots(MavenProject project) {
List<String> l = new ArrayList<>();
if (!"pom".equals(project.getPackaging().toLowerCase(Locale.ENGLISH))) {
l.addAll(project.getCompileSourceRoots());
}
if (project.getExecutionProject() != null) {
if (!"pom".equals(project.getExecutionProject().getPackaging().toLowerCase(Locale.ENGLISH))) {
l.addAll(project.getExecutionProject().getCompileSourceRoots());
}
}
return l;
}