Lambda expression used inside include is not valid.

An invalid lambda expression used inside the include tag can cause an error in your HTML code. Let’s understand this in detail with an example:

        
            <%@ include file="/some/include.jsp" %>
        
    

In this example, we have an include tag that includes the “/some/include.jsp” file. Now, let’s say that inside the “include.jsp” file, we have a lambda expression that is not valid. This could be due to various reasons like a syntax error or an incorrect usage of the lambda expression.

Here’s an example of an invalid lambda expression:

        
            <% (x, y) -> x + y %>
        
    

This lambda expression is invalid because it is missing the necessary curly braces and return statement. A correct lambda expression would be:

        
            <% (x, y) -> { return x + y; } %>
        
    

When the invalid lambda expression is used inside the include tag, it can cause the HTML code to break and display an error. To fix this issue, you need to ensure that the lambda expression used inside the include tag is valid.