> don't call `unregister` here. When shutdown hook runs, it will lead to
> IllegalStateException if we try to remove the hook.
>
> ```java
> static synchronized void add(Thread hook) {
> if(hooks == null)
> throw new IllegalStateException("Shutdown in progress");
>
> if (hook.isAlive())
> throw new IllegalArgumentException("Hook already running");
>
> if (hooks.containsKey(hook))
> throw new IllegalArgumentException("Hook previously registered");
>
> hooks.put(hook, hook);
> }
> ```
I remove it
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3280 ]
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