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Why we need BO(Business Logic Object) in the system design

When working with current system, the previous developers just use the Struts2 Action to deal with all the logical things in the system. Then, it becomes a problem. It introduce huge duplicated codes which made me just like a robot to fix one issue 3 or 4 times.
One solution could be move those kind of common methods to the super action, which is just a bit bad smell :)

This is why we need BO(Business Logic Object) in the system architecture design phase

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