in src/main/java/org/apache/maven/plugins/clean/Cleaner.java [383:393]
synchronized void init(File fastDir, File dir) {
if (fastDir.isDirectory()) {
File[] children = fastDir.listFiles();
if (children != null && children.length > 0) {
for (File child : children) {
doDelete(child);
}
}
}
doDelete(dir);
}