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Ashik Uzzaman
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In Struts Javadoc of org.apache.struts.action.ActionForm class, I found the following entry (http://struts.apache.org/api/index.html).

ActionForms are JavaBeans, subclasses should also implement Serializable, as required by the JavaBean specification.

But as we know from Java language basics, if a super class A implements an interface X, then any instance of subclass of class A, for example B that extends class A, will be automatically an instance of C as well. Then why a subclass of ActionForm should implement Serializable again as ActionFrom itself implements Serializable interface?

 
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