docs: private static boolean isZip(ArtifactEntry artifactEntry) {
          if ( !hasZipExtension( artifactEntry.getName() ) ) {
              return false;
          }
  
          boolean validZip = false;
  
          InputStream entryInputStream = null;
          try {
              entryInputStream = artifactEntry.getInputStream();
              if ( entryInputStream == null ) {
                  return false;
              }
  
              ZipInputStream zipInputStream = new ZipInputStream(entryInputStream);
              try {
                  ZipEntry entry = zipInputStream.getNextEntry();
                  if ( entry == null ) {
                      Tr.error(tc, "bad.zip.data", getPhysicalPath(artifactEntry));
                  } else {
                      validZip = true;
                  }
              } catch ( IOException e ) {
                  String entryPath = getPhysicalPath(artifactEntry);
                  Tr.error(tc, "bad.zip.data", entryPath);
              }
  
              try {
                  // attempt to close the zip, ignoring any error because we can't recover.
                  zipInputStream.close();
              } catch (IOException ioe) {
                  // FFDC
              }
          } catch ( IOException e1 ) {
              // FFDC
              return false;
          }
  
          return validZip;
      }