fix: in some cases, try to use pom info to guess name and version to top level jar

syft/pkg/cataloger/java/archive_parser.go

@@ -149,7 +149,6 @@ func (j *archiveParser) parse() ([]pkg.Package, []artifact.Relationship, error)
 // discoverMainPackage parses the root Java manifest used as the parent package to all discovered nested packages.
 func (j *archiveParser) discoverMainPackage() (*pkg.Package, error) {
 	// search and parse java manifest files
-	// TODO: do we want to prefer or check for pom files over manifest here?
 	manifestMatches := j.fileManifest.GlobMatch(manifestGlob)
 	if len(manifestMatches) > 1 {
 		return nil, fmt.Errorf("found multiple manifests in the jar: %+v", manifestMatches)
@@ -186,9 +185,24 @@ func (j *archiveParser) discoverMainPackage() (*pkg.Package, error) {
 
 	// we use j.location because we want to associate the license declaration with where we discovered the contents in the manifest
 	licenses := pkg.NewLicensesFromLocation(j.location, selectLicenses(manifest)...)
+	/*
+		We should name and version from, in this order:
+		1. pom.properties if we find exactly 1
+		2. pom.xml if we find exactly 1
+		3. manifest
+		4. filename
+	*/
+	name, version := j.guessMainPackageNameAndVersionFromPomInfo()
+	if name == "" {
+		name = selectName(manifest, j.fileInfo)
+	}
+	if version == "" {
+		version = selectVersion(manifest, j.fileInfo)
+	}
 	return &pkg.Package{
-		Name:     selectName(manifest, j.fileInfo),
-		Version:  selectVersion(manifest, j.fileInfo),
+		// TODO: maybe select name should just have a pom properties in it?
+		Name:     name,
+		Version:  version,
 		Language: pkg.Java,
 		Licenses: pkg.NewLicenseSet(licenses...),
 		Locations: file.NewLocationSet(
@@ -204,6 +218,37 @@ func (j *archiveParser) discoverMainPackage() (*pkg.Package, error) {
 	}, nil
 }
 
+func (j *archiveParser) guessMainPackageNameAndVersionFromPomInfo() (string, string) {
+	pomPropertyMatches := j.fileManifest.GlobMatch(pomPropertiesGlob)
+	pomMatches := j.fileManifest.GlobMatch(pomXMLGlob)
+	var pomPropertiesObject pkg.PomProperties
+	var pomProjectObject pkg.PomProject
+	if len(pomPropertyMatches) == 1 && len(pomMatches) == 1 {
+		// we have exactly 1 pom.properties in the archive; assume it represents the
+		// package we're scanning
+		properties, _ := pomPropertiesByParentPath(j.archivePath, j.location, pomPropertyMatches)
+		projects, _ := pomProjectByParentPath(j.archivePath, j.location, pomMatches)
+
+		for parentPath, propertiesObj := range properties {
+			if propertiesObj.ArtifactID != "" && j.fileInfo.name != "" && strings.HasPrefix(propertiesObj.ArtifactID, j.fileInfo.name) {
+				pomPropertiesObject = propertiesObj
+				if proj, exists := projects[parentPath]; exists {
+					pomProjectObject = proj
+				}
+			}
+		}
+	}
+	name := pomPropertiesObject.ArtifactID
+	if name == "" {
+		name = pomProjectObject.ArtifactID
+	}
+	version := pomPropertiesObject.Version
+	if version == "" {
+		version = pomProjectObject.Version
+	}
+	return name, version
+}
+
 // discoverPkgsFromAllMavenFiles parses Maven POM properties/xml for a given
 // parent package, returning all listed Java packages found for each pom
 // properties discovered and potentially updating the given parentPkg with new

test/integration/regression_java_virtualpath_test.go

@@ -0,0 +1,37 @@
+package integration
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/source"
+)
+
+func TestWarCatalogedCorrectlyIfRenamed(t *testing.T) {
+	// install hudson-war@2.2.1 and renames the file to `/hudson.war`
+	// TODO: is this better expressed in syft/pkg/cataloger/java/archive_parser_test.go?
+	sbom, _ := catalogFixtureImage(t, "image-java-virtualpath-regression", source.SquashedScope, nil)
+
+	badPURL := "pkg:maven/hudson/hudson@2.2.1"
+	goodPURL := "pkg:maven/org.jvnet.hudson.main/hudson-war@2.2.1"
+	foundCorrectPackage := false
+	badVirtualPath := "/hudson.war:org.jvnet.hudson.main:hudson-war"
+	goodVirtualPath := "/hudson.war"
+	for _, p := range sbom.Artifacts.Packages.Sorted() {
+		if p.Type == pkg.JavaPkg && strings.Contains(p.Name, "hudson") {
+			assert.NotEqual(t, badPURL, p.PURL, "must not find bad purl %q", badPURL)
+			virtPath := ""
+			if meta, ok := p.Metadata.(pkg.JavaMetadata); ok {
+				virtPath = meta.VirtualPath
+				if p.PURL == goodPURL && virtPath == goodVirtualPath {
+					foundCorrectPackage = true
+				}
+			}
+			assert.NotEqual(t, badVirtualPath, virtPath, "must not find bad virtual path %q", badVirtualPath)
+		}
+	}
+	assert.True(t, foundCorrectPackage, "must find correct package, but did not")
+}

test/integration/test-fixtures/image-java-virtualpath-regression/Dockerfile

@@ -0,0 +1,7 @@
+FROM alpine:latest
+
+RUN wget https://repo1.maven.org/maven2/org/jvnet/hudson/main/hudson-war/2.2.1/hudson-war-2.2.1.war
+
+RUN mv hudson-war-2.2.1.war hudson.war
+
+