in src/main/java/org/apache/maven/plugins/resources/ResourcesMojo.java [414:428]
protected List<String> getCombinedFiltersList() {
if (filters == null || filters.isEmpty()) {
return useBuildFilters ? buildFilters : null;
} else {
List<String> result = new ArrayList<>();
if (useBuildFilters && buildFilters != null && !buildFilters.isEmpty()) {
result.addAll(buildFilters);
}
result.addAll(filters);
return result;
}
}