The Swing CompoentTag should null-out the reference to its bean after it's done executed. No tags keep a reference to the ComponentTag itself, at most they'll get a reference to the underlying bean.
At the moment, ComponentTag can cause it's bean to stick around in memory unexpectedly. The Tag instance might be cached by the TagScript for later reuse. If the Tag keeps a reference to it's component, then that component won't be GC'd, even if the component is disposed. And the component itself will never be resued, so there's no point in keeping it around.