code: public static File convertPathToFile(String filePath, BootstrapConfig bootProps) {
          if (filePath == null) {
              throw new NullPointerException();
          }
          File resolvedFile = null;
  
          String resolvedPath = normalizeFilePath(bootProps.replaceSymbols(filePath));
          resolvedFile = new File(resolvedPath);
          if (!resolvedFile.isAbsolute()) {
              resolvedFile = bootProps.getConfigFile(resolvedPath);
          }
          return resolvedFile;
      }
docs: Convert the file path string to a file.
  If the filePath starts with a wlp pre-defined location symbol, will translate it to an absolute file path;
  If the filePath is a relative path, the File returned will be relative to the server's directory (as provided by
  {@link com.ibm.ws.kernel.boot.BootstrapConfig#getConfigFile(String) BootstrapConfig.getSeverFile(filePath)} If an unknown location symbol is used in the filePath, an
  IllegalArgument Exception will be thrown.
  
  @param filePath
  @return
  @exception IllegalArgumentException if the location symbol could not be resolved