public static RuntimeFieldFactory<?> getFieldFactory(Class<?> clazz)
    {
        return getFieldFactory(clazz, RuntimeEnv.ID_STRATEGY);
    }
Gets the runtime field factory of the given {@code clazz}.
<p>
Method overload for backwards compatibility.
protostuff-runtime-md/src/main/java/io/protostuff/runtime/RuntimeFieldFactory.java