You can use “JSP-style” comments to selectively block out code while debugging or simply to comment your scriptlets. JSP comments are not visible at the client.
<%-- the scriptlet is now commented out
You can also use HTML-style comments anywhere within your JSP page. These comments are visible at the client. For example:
<!-- (c) 2004 -->
Of course, you can also use comments supported by your JSP scripting language within your scriptlets. For example, assuming Java is the scripting language, you can have:
yet another comment