* <i>other type</i> of supplier is expected, use the method reference {@code supplier::get}. A
 * future version of {@code com.google.common.base.Supplier} will be made to <i>extend</i> {@code
 * java.util.function.Supplier}, making conversion code necessary only in one direction. At that
 * time, this interface will be officially discouraged.
 *
 * @author Harry Heymann
 * @since 2.0
 */

        requireNonNull(request, "request");

        // apply MavenExecutionRequestExtenders
        for (MavenExecutionRequestExtender requestExtender : requestExtenders.values()) {
            requestExtender.extend(request);
        }

        MavenSessionBuilderSupplier supplier = new MavenSessionBuilderSupplier(repoSystem);
        SessionBuilder sessionBuilder = supplier.get();

      throw new ExecutionError((Error) cause);
    }
    /*
     * It's an Exception. (Or it's a non-Error, non-Exception Throwable. From my survey of such
     * classes, I believe that most users intended to extend Exception, so we'll treat it like an
     * Exception.)
     */
    throw new UncheckedExecutionException(cause);
  }

  /*