I am new to Struts framework. I am getting a little confusion if DynaActionForm is not supporting validation why framework introduced this form bean class. As we have so many disadvantages like:
The DynaActionForm bloats up the Struts config file with the xml based definition. This gets annoying as the Struts Config file grow larger.
The DynaActionForm is not strongly typed as the ActionForm. This means there is no compile time checking for the form fields. Detecting them at runtime is painful and makes you go through redeployment.
ActionForm can be cleanly organized in packages as against the flat organization in the Struts Config file.
ActionForm were designed to act as a Firewall between HTTP and the Action classes, i.e. isolate and encapsulate the HTTP request parameters from direct use in Actions. With DynaActionForm, the property access is no different than using request.getParameter(some parameters).
DynaActionForm construction at runtime requires a lot of Java Reflection machinery that can be expensive.
