int () { int result = artifactId != null ? artifactId.hashCode() : 0; result = 31 * result + (groupId != null ? groupId.hashCode() : 0); result = 31 * result + (version != null ? version.hashCode() : 0); result = 31 * result + (classifier != null ? classifier.hashCode() : 0); result = 31 * result + (extension != null ? extension.hashCode() : 0); result = 31 * result + (properties != null ? properties.hashCode() : 0); return result; }