your <%= //map.size() %> doesnt simply work because it should have been
<% //= map.size() %>
One of:
In html
<!-- map.size here because -->
<%= map.size() %>
theoretically the following should work, but i never used it this way.
<%= map.size() // map.size here because %>
There are multiple way to comment in a JSP file.
1. <%-- comment --%>
A JSP comment. Ignored by the JSP engine. Not visible in client machine (Browser source code).
2. <!-- comment -->
An HTML comment. Ignored by the browser. It is visible in client machine (Browser source code) as a comment.
3. <% my code //my comment %>
Java Single line comment. Ignored by the Compiler. Not visible in client machine (Browser source code).
4. <% my code /**
my comment **/
%>
Java Multi line comment. Ignored by the compiler. Not visible in client machine (Browser source code).
But one should use only comment type 1 and 2 because java documentation suggested. these two comment types (1 & 2) are designed for JSP.
your <%= //map.size() %> doesnt simply work because it should have been
<% //= map.size() %>
My Suggestion best way use comments in JSP page <%-- Comment --%>
. Because It will not displayed (will not rendered in HTML pages) in client browsers.
There are multiple way to comment in a JSP file.
1. <%-- comment --%>
A JSP comment. Ignored by the JSP engine. Not visible in client machine (Browser source code).
2. <!-- comment -->
An HTML comment. Ignored by the browser. It is visible in client machine (Browser source code) as a comment.
3. <% my code //my comment %>
Java Single line comment. Ignored by the Compiler. Not visible in client machine (Browser source code).
4. <% my code /**
my comment **/
%>
Java Multi line comment. Ignored by the compiler. Not visible in client machine (Browser source code).
But one should use only comment type 1 and 2 because java documentation suggested. these two comment types (1 & 2) are designed for JSP.
You can use this comment in jsp page
<%--your comment --%>
Second way of comment declaration in jsp page you can use the comment of two typ in jsp code
single line comment
<% your code //your comment%>
multiple line comment
<% your code
/**
your another comment
**/
%>
And you can also comment on jsp page from html code for example:
<!-- your commment -->
One of:
In html
<!-- map.size here because -->
<%= map.size() %>
theoretically the following should work, but i never used it this way.
<%= map.size() // map.size here because %>
You can use this comment in jsp page
<%--your comment --%>
Second way of comment declaration in jsp page you can use the comment of two typ in jsp code
single line comment
<% your code //your comment%>
multiple line comment
<% your code
/**
your another comment
**/
%>
And you can also comment on jsp page from html code for example:
<!-- your commment -->
One of:
In html
<!-- map.size here because -->
<%= map.size() %>
theoretically the following should work, but i never used it this way.
<%= map.size() // map.size here because %>
My Suggestion best way use comments in JSP page <%-- Comment --%>
. Because It will not displayed (will not rendered in HTML pages) in client browsers.
When you don't want the user to see the comment use:
<%-- comment --%>
If you don't care / want the user to be able to view source and see the comment you can use:
<!-- comment -->
When in doubt use the JSP comment.
your <%= //map.size() %> doesnt simply work because it should have been
<% //= map.size() %>
When you don't want the user to see the comment use:
<%-- comment --%>
If you don't care / want the user to be able to view source and see the comment you can use:
<!-- comment -->
When in doubt use the JSP comment.
Source: Stackoverflow.com