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What are the custom tags?
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Explain the necessity of empty tag?
In ActionClass we can use only one action i.e execute(), but in DispatchAction we can use multiple actions.My question is , we can use multiple actions in Action class if(action.equals("add") if(action.equals("update"). Then when to use Action and DispatchAction which is frequently in webapplications.
What is the default location of result pages and how can we change it?
why do we use logic tag library in struts?
Can you explain struts validator framework?
How many action classes can be used in struts application?
What is the use of struts config xml file?
How the exceptions are handled in struts?
What do you mean by action errors and what are the results they force?
How properties of a form are validated in Struts?
How do you create message resource?
explain the Struts flow?
Core Java 
