My emails will need to be HTML anyway and I don't want to introduce another HTML generation mechanism (eg Velocity) into my project if I don't have to. It would be nice if image references in the generated HTML could be converted into attachments automatically.
You should fire a HTTP request on it.
InputStream response = new URL("http://localhost/context/page.jsp").openStream();
If you want to let the JSP access the same session as the current request, do so:
String url = "http://localhost/context/page.jsp";
String jsessionid = "jsessionid=" + request.getSession().getId();
InputStream response = new URL(url + ";" + jsessionid).openStream();
Needless to say that JSP is not entirely the right tool for the job. JSP is a webbased view technology, not a standalone template technology. Look, you need to fire a whole HTTP request just to get its output. While not necessarily expensive, this is hacky.
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