in src/main/java/org/apache/maven/plugins/war/overlay/OverlayManager.java [214:225]
private List<Artifact> getOverlaysAsArtifacts() {
ScopeArtifactFilter filter = new ScopeArtifactFilter(Artifact.SCOPE_RUNTIME);
final Set<Artifact> artifacts = project.getArtifacts();
final List<Artifact> result = new ArrayList<>();
for (Artifact artifact : artifacts) {
if (!artifact.isOptional() && filter.include(artifact) && ("war".equals(artifact.getType()))) {
result.add(artifact);
}
}
return result;
}