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What are the drawbacks of DynaActionForm

Gayathri Chowduru
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Joined: Oct 17, 2007
Posts: 42
Hi Everyone,

I have a question that, what are the drawbacks of DynaActionForm. Why don't we use DynaActionForm for all the projects?

Thanks in Advance

Thanks,
Gayathri Chowduru.
Gowher Naik
Ranch Hand

Joined: Feb 07, 2005
Posts: 643
Check paragraph show below from Struts Survival Guide.

Here are some more downsides of using DynaActionForms
1. The DynaActionForm bloats up the Struts config file with the xml based
definition. This gets annoying as the Struts Config file grow larger.
2. 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.
3. ActionForm can be cleanly organized in packages as against the flat
organization in the Struts Config file.
4. 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(�..�).
5. DynaActionForm construction at runtime requires a lot of Java Reflection
machinery that can be expensive.
6. Time savings from DynaActionForm is insignificant. It doesn�t take long for today�s IDEs to generate getters and setters for the ActionForm attributes.(Let us say that you made a silly typo in accessing the DynaActionForm properties in the Action instance. It takes less time to generate the getters and setters in the IDE than fixing your Action code and redeploying your web application)
That said, DynaActionForms have an important role to play in the project
lifecycle as described earlier, which they do best and let us limit them to just that.
Use them with caution, only when you absolutely need them.
 
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