code: package org.optsol.project_scheduling.tests.utils.io;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.stream.Collectors;
  import lombok.extern.slf4j.Slf4j;
  
  @Slf4j
  public class PathsAndFiles {
  
    public static List<String> getFileListFromResourceDir(String relativePathToDir)
        throws IOException {
      List<String> fileNames = new ArrayList<>();
      final URL url = PathsAndFiles.class.getResource("/" + relativePathToDir);
      if (url != null) {
        try {
          final File apps = new File(url.toURI());
          fileNames = Arrays.stream(apps.list()).collect(Collectors.toList());
        } catch (URISyntaxException ex) {
          // never happens
        }
      }
      return fileNames.stream().filter(s -> !s.isEmpty()).collect(Collectors.toList());
    }
  }
  