code: package it.unibz.inf.ontop.endpoint.beans;
  
  import com.google.gson.Gson;
  import com.moandjiezana.toml.Toml;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.context.annotation.Bean;
  import org.springframework.stereotype.Component;
  
  import javax.annotation.Nonnull;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  
  @Component
  public class PortalConfigComponent {
  
      @Bean
      private PortalConfigSerialization setupPortal(@Value("${portal:#{null}}") String portalConfigFile) throws FileNotFoundException {
          String json;
          if (portalConfigFile != null) {
              Toml toml = new Toml().read(new FileReader(portalConfigFile));
              Gson gson = new Gson();
              json = gson.toJson(toml.toMap());
          } else {
              json = "{}";
          }
          return new PortalConfigSerialization(json);
      }
  
      public static class PortalConfigSerialization {
          public final String jsonString;
  
          public PortalConfigSerialization(@Nonnull String jsonString) {
              this.jsonString = jsonString;
          }
      }
  }
  