private static UnsafeAccessor getUnsafeAccessor0() {
        return hasUnsafe() ? new UnsafeAccessor(UNSAFE) : null;
    }
Gets the field with the given name within the class, or
{@code null} if not found. If found, the field is made accessible.
jraft-core/src/main/java/com/alipay/sofa/jraft/util/internal/UnsafeUtil.java