- parent POM missing (in both the repository + relative path)
- component not found

Plugins:
- plugin metadata missing
- plugin metadata retrieval problem
- plugin artifact missing
- plugin artifact retrieval problem
- plugin dependency metadata missing
- plugin dependency metadata retrieval problem
- plugin configuration problem

h3. Plugins

* Execution model
* Metadata model
* Metadata tooling
 ** Metadata extractor
 ** Metadata reader
 ** Metadata writer
 ** Metadata adapter (if required for the target system)
* Maven packaging and lifecycle
* Maven test harness for plugin execution model
* Eclipse IDE tooling for plugin execution model and metadata model

- we also seem to have information like the plugin lifecycle model that's buried inside the maven execution model

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.artifact.repository.metadata;

import java.util.Iterator;
import java.util.List;

import org.apache.maven.artifact.repository.ArtifactRepository;

/**
 * Metadata for the group directory of the repository.
 *
 */
@Deprecated
public class GroupRepositoryMetadata extends AbstractRepositoryMetadata {

  }

  private static boolean isExcludedMatch(int metadata) {
    return ((metadata >> EXCLUSION_SHIFT) & EXCLUSION_MASK) != 0;
  }

  private @Nullable PublicSuffixType getExactMatchType(int metadata) {
    return getType((metadata >> EXACT_SHIFT) & TYPE_MASK);
  }

  private @Nullable PublicSuffixType getWildcardMatchType(int metadata) {
    return getType((metadata >> WILDCARD_SHIFT) & TYPE_MASK);
  }

	"encoding/binary"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"time"

	"github.com/cespare/xxhash/v2"
	jsoniter "github.com/json-iterator/go"
)

// XL constants.
const (
	// XL metadata file carries per object metadata.
	xlStorageFormatFileV1 = "xl.json"
)

// Valid - tells us if the format is sane by validating
// format version and erasure coding information.
func (m *xlMetaV1Object) valid() bool {

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.RepositoryRequest;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadataResolutionException;
import org.apache.maven.artifact.repository.metadata.Versioning;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;

/**

// from the metadata using the SSE-Copy client key of the HTTP headers
// and returns the decrypted object key.
func (sse ssecCopy) UnsealObjectKey(h http.Header, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {
	clientKey, err := sse.ParseHTTP(h)
	if err != nil {
		return key, err
	}
	return unsealObjectKey(clientKey[:], metadata, bucket, object)
}

import org.apache.maven.artifact.factory.ArtifactFactory;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadataManager;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.plugin.LegacySupport;
import org.apache.maven.project.ProjectBuilder;

/**
 * This realizes the metadata source via the default hint to provide backward-compat with Maven 2.x whose Plexus version

			fi.Metadata[k] = string(v)
		}
	}
	fi.ReplicationState = getInternalReplicationState(fi.Metadata)
	fi.Deleted = !fi.VersionPurgeStatus().Empty()
	replStatus := fi.ReplicationState.CompositeReplicationStatus()
	if replStatus != "" {
		fi.Metadata[xhttp.AmzBucketReplicationStatus] = string(replStatus)
	}

}

// ListObjectVersionsHandler - GET Bucket Object versions
// You can use the versions subresource to list metadata about all
// of the versions of objects in a bucket.
func (api objectAPIHandlers) listObjectVersionsHandler(w http.ResponseWriter, r *http.Request, metadata bool) {
	ctx := newContext(r, w, "ListObjectVersions")

	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	vars := mux.Vars(r)