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I have a .tag file that requires a JavaScript library (as in a .js file).
Currently I am just remembering to import the .js file in every JSP that uses the tag but this is a bit cumbersome and prone to error.
Is there a way to do the importing of the .js inside the JSP tag?
(for caching reasons I would want the .js to be a script import)
There is no reason you cannot have a script tag in the body, even though it is preferable for it to be in the head. Just emit the script tag before you emit your tag’s markup. The only thing to consider is that you do not want to include the script more than once if you use the jsp tag on the page more than once. The way to solve that is to remember that you have already included the script, by addng an attribute to the request object.