in src/main/java/org/apache/maven/plugins/war/packaging/OverlayPackagingTask.java [115:129]
protected File getOverlayTempDirectory(WarPackagingContext context, Overlay overlay) {
final File groupIdDir = new File(context.getOverlaysWorkDirectory(), overlay.getGroupId());
if (!groupIdDir.exists()) {
groupIdDir.mkdir();
}
String directoryName = overlay.getArtifactId();
if (overlay.getClassifier() != null) {
directoryName = directoryName + "-" + overlay.getClassifier();
}
final File result = new File(groupIdDir, directoryName);
if (!result.exists()) {
result.mkdirs();
}
return result;
}