JSP Scriptlets is a term used to refer to pieces of Java code that can be embedded in a JSP PAge. Scriptlets begins with <% tag and ends with %> tag. Java code written inside scriptlet executes every time the JSP is invoked.

In advanced Java, a JSP (JavaServer Pages) scriptlet is a block of Java code embedded within a JSP page. It is enclosed between <% and %> tags. The scriptlet allows you to write Java code directly within the HTML content of a JSP page. When the JSP page is processed, the Java code within the scriptlet is executed, and the output is included in the final HTML sent to the client’s browser.

Here’s an example of a JSP scriptlet:

jsp

<%

  // This is a JSP scriptlet

  String message = "Hello, JSP!";

  out.println(message);

%>

In this example, the Java code within the scriptlet initializes a string variable message and then prints it using the out.println statement. The output of this scriptlet will be included in the HTML response sent to the client. It’s important to note that excessive use of scriptlets is generally discouraged in modern JSP development, and the emphasis is on using JSTL (JavaServer Pages Standard Tag Library) and custom tags for better separation of concerns.