return waitForLoadingValue(e, key, valueReference);
            }
          }
        }

        // at this point e is either null or expired;
        return lockedGetOrLoad(key, hash, loader);
      } catch (ExecutionException ee) {
        Throwable cause = ee.getCause();
        if (cause instanceof Error) {
          throw new ExecutionError((Error) cause);

              return waitForLoadingValue(e, key, valueReference);
            }
          }
        }

        // at this point e is either null or expired;
        return lockedGetOrLoad(key, hash, loader);
      } catch (ExecutionException ee) {
        Throwable cause = ee.getCause();
        if (cause instanceof Error) {
          throw new ExecutionError((Error) cause);