Add digest property to parent and nested java package metadata (#941)

internal/formats/common/spdxhelpers/external_refs.go

@@ -22,5 +22,6 @@ func ExternalRefs(p pkg.Package) (externalRefs []ExternalRef) {
 			ReferenceType:     PurlExternalRefType,
 		})
 	}
+
 	return externalRefs
 }

internal/formats/common/spdxhelpers/to_syft_model.go

@@ -309,6 +309,14 @@ func extractMetadata(p *spdx.Package2_2, info pkgInfo) (pkg.MetadataType, interf
 			Architecture:  arch,
 			Maintainer:    p.PackageOriginatorPerson,
 		}
+	case pkg.JavaPkg:
+		var digests []file.Digest
+		for algorithm, value := range p.PackageChecksums {
+			digests = append(digests, file.Digest{Algorithm: string(algorithm), Value: value.Value})
+		}
+		return pkg.JavaMetadataType, pkg.JavaMetadata{
+			ArchiveDigests: digests,
+		}
 	}
 	return pkg.UnknownMetadataType, nil
 }