// For these users fallback to a suboptimal implementation, based on synchronized. This will
      // be a definite performance hit to those users.
      thrownReflectionFailure = reflectionFailure;
      helper = new SynchronizedAtomicHelper();
    }
    ATOMIC_HELPER = helper;
    // Log after all static init is finished; if an installed logger uses any Futures methods, it
    // shouldn't break in cases where reflection is missing/broken.

    // First ensure that our classloaders are initializing the correct helper versions
    checkHelperVersion(getClass().getClassLoader(), "SafeAtomicHelper");
    checkHelperVersion(NO_ATOMIC_FIELD_UPDATER, "SynchronizedAtomicHelper");

    // Run the corresponding FuturesTest test method in a new classloader that disallows
    // certain core jdk classes.
    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();

    // First ensure that our classloaders are initializing the correct helper versions
    checkHelperVersion(getClass().getClassLoader(), "SafeAtomicHelper");
    checkHelperVersion(NO_ATOMIC_FIELD_UPDATER, "SynchronizedAtomicHelper");

    // Run the corresponding FuturesTest test method in a new classloader that disallows
    // certain core jdk classes.
    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();