I am working with Eclipse IDE and trying struts application in that. My doubt is that should i need to import struts-bank.war file in order for my application to work fine or can i myself write the struts-taglib without importing the struts-blank.war file.
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The struts-blank.war file is strictly a convenience to help you get the structure of the application right. It is not required. You may want to set up your own template for new applications that includes things you know you always want to do for a Struts application and use that instead.
When you're just starting out, though, it makes sense to use the struts-blank.war, because it's easy to make a small mistake in setting up a new application that using the struts-blank.war would have prevented you from making.