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Question: What is the difference between ActionForm and DynaActionForm

Answer: # 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( .. ).

# DynaActionForm construction at runtime requires a lot of Java Reflection (Introspection) machinery that can be avoided.

# 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)

Submitted by Mohd Taqiuddin ( mtaqi@techie.com )



Category Struts Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is the difference between ActionForm and DynaActionForm
Answer:

# 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( .. ).

# DynaActionForm construction at runtime requires a lot of Java Reflection (Introspection) machinery that can be avoided.

# 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)

Submitted by Mohd Taqiuddin ( mtaqi@techie.com ) Source: CoolInterview.com


When we are using Dynamic forms no need to write a java class with fields,setters,getters,reset(),validate(). Instead of java class we can specify the fields directly in the struts configuration document
When we are writing static forms we are overriding reset() method to reset the form-fields to required.
In the case of dynamic forms resetting the fields to default values of the specified data-type will happen automatically.
If we want any other values we have to specify explicitly using initial attribute of <form-property> tag.
In the case of Static forms we are overriding the validate() method for validating input data whereas in dynamic forms we have to use validation framework.
Source: CoolInterview.com

Answered by: T.N ARJUN | Date: 6/23/2010 | Contact T.N ARJUN Contact T.N ARJUN


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