Difference between jsp expression tags <% and <%=

Question

I more or less know the difference between <%! and <%, but I can\'t seem to find the difference between <%= and <%. I\'m trying to avoid a null value error by intr

Answer 1

Between <%...%>you can write any logic that you want in java.

Using <%=...%> will output the result of the expression between the brackets to the screen. So instead of writing for example

<% System.out.println("Hello World") %> 

you can simply write

<%= "Hello world" %> 

Basically, what <%= %> does is to call the toString() method of the expression that is being evaluated.

If you need to add null check logic as you said you need you can use

 <%..%>

Here's a link you can refer to:

http://www.easywayserver.com/jsp/JSP-example.htm http://www.tutorialspoint.com/jsp/jsp_syntax.htm