fix(java): skip empty files for jar post analyzer (#3832)

pkg/parallel/walk.go

@@ -8,6 +8,7 @@ import (
 	"golang.org/x/xerrors"
 
 	dio "github.com/aquasecurity/go-dep-parser/pkg/io"
+	"github.com/aquasecurity/trivy/pkg/log"
 )
 
 type onFile[T any] func(string, fs.FileInfo, dio.ReadSeekerAt) (T, error)
@@ -28,6 +29,15 @@ func WalkDir[T any](ctx context.Context, fsys fs.FS, root string, slow bool,
 				return nil
 			}
 
+			// check if file is empty
+			info, err := d.Info()
+			if err != nil {
+				return err
+			} else if info.Size() == 0 {
+				log.Logger.Debugf("%s is empty, skip this file", path)
+				return nil
+			}
+
 			select {
 			case paths <- path:
 			case <-ctx.Done():