> Whether needing to re-consider the modification way?
If I understand @iocanel's comment correctly, please extract the multiple
invocations of
```
if (shellTableFactory == null){
shellTableFactory = new PropertyShellTableFactory();
}
```
into an `initShellTableFactory` or similar method in the base class and then
call that method from the child classes. Also, is there some way to avoid
having to call this on _each_ execution?
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